diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
index 77d5a21..f1ca400 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
@@ -6,12 +6,16 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
-#include <stdexcept>
+#include "ComboPackage.h"
 #include "Controller.h"
 #include "Enums.h"
+#include "InventoryItem.h"
+#include "Invoice.h"
+#include "JobCard.h"
+#include "Service.h"
+#include "ServiceBooking.h"
 #include "User.h"
-#include "ComboPackage.h"
-#include "User.h"
+#include <stdexcept>
 
 /*
 Function: login
@@ -106,9 +110,23 @@ void Controller::updateUserDetails(const std::string& email, const std::string&
     m_userManagementService.updateUserDetails(authenticatedUser->getId(), email, phone);
 }
 
+/*
+Function: getServices
+Description: Retrieves all available services in read-only form.
+Parameters:
+    - None
+Returns:
+    - util::Map<std::string, const Service*> containing all services
+*/
 util::Map<std::string, const Service*> Controller::getServices()
 {
-    return util::Map<std::string, const Service*>();
+    util::Map<std::string, Service*> currentServices = m_serviceManagementService.getServices();
+    util::Map<std::string, const Service*> readOnlyServices;
+    for (int iterator = 0; iterator < currentServices.getSize(); iterator++)
+    {
+        readOnlyServices.insert(currentServices.getValueAt(iterator)->getId(), currentServices.getValueAt(iterator));
+    }
+    return readOnlyServices;
 }
 
 /*
@@ -227,14 +245,42 @@ void Controller::addInventoryItemStock(const std::string& selectedItemId, int qu
     m_inventoryManagementService.addInventoryItemStock(selectedItemId, quantity);
 }
 
+/*
+Function: getServiceBookings
+Description: Retrieves all service bookings in read-only form.
+Parameters:
+    - None
+Returns:
+    - util::Map<std::string, const ServiceBooking*> containing service bookings
+*/
 util::Map<std::string, const ServiceBooking*> Controller::getServiceBookings()
 {
-    return util::Map<std::string, const ServiceBooking*>();
+    auto serviceBookings = m_serviceManagementService.getServiceBookings();
+    util::Map<std::string, const ServiceBooking*> readOnlyServiceBookings;
+    for (int iterator = 0; iterator < serviceBookings.getSize(); iterator++)
+    {
+        readOnlyServiceBookings.insert(serviceBookings.getKeyAt(iterator), serviceBookings.getValueAt(iterator));
+    }
+    return readOnlyServiceBookings;
 }
 
+/*
+Function: getServiceBookingsByUser
+Description: Retrieves all service bookings for a specific user.
+Parameters:
+    - userID: std::string, the user ID
+Returns:
+    - util::Map<std::string, const ServiceBooking*> containing bookings for the user
+*/
 util::Map<std::string, const ServiceBooking*> Controller::getServiceBookingsByUser(const std::string userID)
 {
-    return util::Map<std::string, const ServiceBooking*>();
+    util::Map<std::string, const ServiceBooking*> readOnlyServiceBookingsByUserMap;
+    util::Map<std::string, ServiceBooking*> currentServiceBookingsByUser = m_serviceManagementService.getServiceBookings(userID);
+    for (int iterator = 0; iterator < currentServiceBookingsByUser.getSize(); iterator++)
+    {
+        readOnlyServiceBookingsByUserMap.insert(currentServiceBookingsByUser.getValueAt(iterator)->getId(), currentServiceBookingsByUser.getValueAt(iterator));
+    }
+    return readOnlyServiceBookingsByUserMap;
 }
 
 /*
@@ -255,30 +301,100 @@ util::Map<std::string, const User*> Controller::getUsers()
     return readOnlyUserList;
 }
 
+/*
+Function: getUsers
+Description: Retrieves users filtered by user type.
+Parameters:
+    - userType: util::UserType, type of user (CUSTOMER, TECHNICIAN, ADMIN)
+Returns:
+    - util::Map<std::string, const User*> containing users of the specified type
+*/
 util::Map<std::string, const User*> Controller::getUsers(util::UserType userType)
 {
-    return util::Map<std::string, const User*>();
+    auto userMap = m_userManagementService.getUsers(userType);
+    util::Map<std::string, const User*> readOnlyUserMap;
+    for (int iterator = 0; iterator < userMap.getSize(); iterator++)
+    {
+        readOnlyUserMap.insert(userMap.getKeyAt(iterator), userMap.getValueAt(iterator));
+    }
+    return readOnlyUserMap;
 }
 
+/*
+Function: createJobCard
+Description: Creates a job card for a service booking assigned to a technician.
+Parameters:
+    - bookingID: std::string, ID of the service booking
+    - technicianID: std::string, ID of the technician
+    - serviceID: std::string, ID of the service
+Returns:
+    - void
+*/
 void Controller::createJobCard(const std::string& bookingID, const std::string& technicianID, const std::string& serviceID)
 {
+    m_serviceManagementService.createJobCard(bookingID, technicianID, serviceID);
 }
 
+/*
+Function: createService
+Description: Creates a new service with associated inventory items and labor cost.
+Parameters:
+    - name: std::string, name of the service
+    - inventoryItemIDs: Vector of inventory item IDs
+    - laborCost: double, labor cost
+Returns:
+    - void
+*/
 void Controller::createService(const std::string& name, const util::Vector<std::string>& inventoryItemIDs, double laborCost)
 {
+    m_serviceManagementService.createService(name, inventoryItemIDs, laborCost);
 }
 
+/*
+Function: removeService
+Description: Removes a service from the system by ID.
+Parameters:
+    - serviceID: std::string, ID of the service
+Returns:
+    - void
+*/
 void Controller::removeService(const std::string& serviceID)
 {
+    m_serviceManagementService.removeService(serviceID);
 }
 
+/*
+Function: getJobCardsByUser
+Description: Retrieves job cards assigned to the authenticated technician.
+Parameters:
+    - None
+Returns:
+    - util::Map<std::string, const JobCard*> containing job cards
+*/
 util::Map<std::string, const JobCard*> Controller::getJobCardsByUser()
 {
-    return util::Map<std::string, const JobCard*>();
+    const User* currentUser = getAuthenticatedUser();
+    auto jobCardsAssignedToTechnician = m_serviceManagementService.getJobCards(currentUser->getId());
+    util::Map<std::string, const JobCard*> readOnlyJobCardMap;
+    for (int iterator = 0; iterator < jobCardsAssignedToTechnician.getSize(); iterator++)
+    {
+        JobCard* currentJobCard = jobCardsAssignedToTechnician.getValueAt(iterator);
+        readOnlyJobCardMap.insert(currentJobCard->getId(), currentJobCard);
+    }
+    return readOnlyJobCardMap;
 }
 
+/*
+Function: completeJob
+Description: Marks a job card as completed.
+Parameters:
+    - jobID: std::string, ID of the job card
+Returns:
+    - void
+*/
 void Controller::completeJob(const std::string& jobID)
 {
+    m_serviceManagementService.completeJob(jobID);
 }
 
 /*
@@ -326,13 +442,40 @@ void Controller::removeComboPackage(const std::string& comboPackageID)
     m_serviceManagementService.removeComboPackage(comboPackageID);
 }
 
+/*
+Function: getInvoicesByUser
+Description: Retrieves all invoices associated with the currently authenticated user.
+             Converts them into a read-only map before returning.
+Parameters:
+    - None
+Returns:
+    - util::Map<std::string, const Invoice*> containing the user’s invoices
+*/
 util::Map<std::string, const Invoice*> Controller::getInvoicesByUser()
 {
-    return util::Map<std::string, const Invoice*>();
+    User* currentUser = m_authenticationManagementService.getAuthenticatedUser();
+    util::Map<std::string, Invoice*> currentUserInvoices =  m_paymentManagementService.getInvoices(currentUser->getId());
+    util::Map<std::string, const Invoice*> userInvoicesReadOnly;
+    for (int iterator = 0; iterator < currentUserInvoices.getSize(); iterator++)
+    {
+        Invoice* currentInvoice = currentUserInvoices.getValueAt(iterator);
+        userInvoicesReadOnly.insert(currentInvoice->getId(), currentInvoice);
+    }
+    return userInvoicesReadOnly;
 }
 
+/*
+Function: completePayment
+Description: Completes payment for a specific invoice using the given payment mode.
+Parameters:
+    - invoiceID: std::string, ID of the invoice to be paid
+    - paymentMode: util::PaymentMode, mode of payment (e.g., ONLINE, OFFLINE)
+Returns:
+    - void
+*/
 void Controller::completePayment(const std::string& invoiceID, util::PaymentMode paymentMode)
 {
+    m_paymentManagementService.completePayment(invoiceID, paymentMode);
 }
 
 /*
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
index 9f17d20..e75ebd4 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
@@ -8,19 +8,14 @@ Date:19-May-2026
 */
 
 #pragma once
+#include <string>
 #include "AuthenticationManagementService.h"
 #include "Enums.h"
 #include "InventoryManagementService.h"
 #include "Map.h"
 #include "PaymentManagementService.h"
-#include "PaymentManagementService.h"
-#include "ServiceManagementService.h"
-#include "ServiceManagementService.h"
 #include "ServiceManagementService.h"
 #include "UserManagementService.h"
-#include "UserManagementService.h"
-#include "UserManagementService.h"
-#include <string>
 
 class Service;
 class ComboPackage;
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
index d1dc0c4..f24a013 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.cpp
@@ -58,8 +58,8 @@ Invoice::Invoice(
     const std::string& bookingId,
     ServiceBooking* booking,
     const util::Timestamp& invoiceDate, 
-    double laborCost, const util::Map<std::string,
-    InventoryItem*>& parts,
+    double laborCost, 
+    const util::Map<std::string, InventoryItem*>& parts,
     double partsCost,
     double discountPercentage, 
     double totalAmount, 
@@ -87,7 +87,6 @@ Invoice::Invoice(
         m_partIDs.push_back(partPointers[index]->getId());
     }
 }
-
 Invoice::Invoice(
     const std::string& id,
     const std::string& bookingId,
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.h
index a226038..3374de9 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/Invoice.h
@@ -40,8 +40,8 @@ public:
         const std::string& bookingId,
         ServiceBooking* booking,
         const util::Timestamp& invoiceDate, 
-        double laborCost, const util::Map<std::string,
-        InventoryItem*>& parts,
+        double laborCost, 
+        const util::Map<std::string,InventoryItem*>& parts,
         double partsCost,
         double discountPercentage, 
         double totalAmount, 
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/JobCard.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/JobCard.h
index da15959..a845263 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/JobCard.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/models/JobCard.h
@@ -9,8 +9,8 @@ Date:19-May-2026
 
 #pragma once
 #include <string>
-#include "Timestamp.h"
 #include "Enums.h"
+#include "Timestamp.h"
 
 class ServiceBooking;
 class Service;
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/PaymentManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/PaymentManagementService.cpp
index 7cdd80a..a922f31 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/PaymentManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/PaymentManagementService.cpp
@@ -12,8 +12,11 @@ Date: 20-May-2026
 #include "Enums.h"
 #include "Factory.h"
 #include "FileManager.h"
+#include "InventoryItem.h"
 #include "Invoice.h"
+#include "JobCard.h"
 #include "PaymentManagementService.h"
+#include "Service.h"
 #include "ServiceBooking.h"
 #include "Timestamp.h"
 #include "User.h"
@@ -252,4 +255,132 @@ Returns:
 void PaymentManagementService::saveObservers()
 {
     util::saveObservers(config::file::PAYMENTMANAGEMENTOBSERVERS, this);
+}
+
+/*
+Function: createInventoryItemsMap (static helper)
+Description: Builds a map of inventory items required for a given service and adds them to the booking’s inventory map.
+Parameters:
+	- completeInventoryItemMapOfBooking: util::Map<std::string, InventoryItem*>&, map to store inventory items for the booking
+	- currentService: const Service*, pointer to the current service
+Returns:
+	- void
+*/
+static void createInventoryItemsMap(util::Map<std::string, InventoryItem*>& completeInventoryItemMapOfBooking, const Service* currentService)
+{
+	auto& currentRequiredInventoryItems = currentService->getRequiredInventoryItems();
+	for (int iterator = 0; iterator < currentRequiredInventoryItems.getSize(); iterator++)
+	{
+		auto& currentRequiredInventoryItem = currentRequiredInventoryItems.getValueAt(iterator);
+		completeInventoryItemMapOfBooking.insert(currentRequiredInventoryItem->getId(), currentRequiredInventoryItem);
+	}
+}
+
+/*
+Function: generateInvoice
+Description: Generates an invoice for a completed service booking.
+			 Validates that all job cards are completed, calculates labor and parts cost, applies discount,
+			 and stores the invoice in the datastore.
+Parameters:
+	- booking: ServiceBooking*, pointer to the service booking
+Returns:
+	- void
+Throws:
+	- std::runtime_error if booking is null or job cards are incomplete
+*/
+void PaymentManagementService::generateInvoice(ServiceBooking* booking)
+{
+	if (!booking)
+	{
+		throw std::runtime_error("Invoice generation failed: booking is null.");
+	}
+	double totalLabourCost = 0, totalPartsCost = 0, totalServiceCost = 0;
+	double discountPercentage = booking->getDiscountPercentage();
+	std::string bookingID = booking->getId();
+	util::Map<std::string, Service*> servicesInTheBookedService = booking->getServices();
+	util::Map<std::string, InventoryItem*> completeInventoryItemMapOfBooking;
+	util::Map<std::string, JobCard*> currentJobCards = m_dataStore.getJobCards();
+	for (int iterator = 0; iterator < currentJobCards.getSize(); iterator++)
+	{
+		JobCard* currentJobCard = currentJobCards.getValueAt(iterator);
+		if (currentJobCard->getBookingId() == bookingID && currentJobCard->getStatus() != util::ServiceJobStatus::COMPLETED)
+		{
+			throw std::runtime_error("Invoice generation failed: not all job cards are completed for booking '" + bookingID + "'.");
+		}
+	}
+	for (int iterator = 0; iterator < servicesInTheBookedService.getSize(); iterator++)
+	{
+		Service* currentService = servicesInTheBookedService.getValueAt(iterator);
+		if (currentService)
+		{
+			createInventoryItemsMap(completeInventoryItemMapOfBooking, currentService);
+			totalLabourCost += currentService->getLaborCost();
+			totalPartsCost += calculatePartsCost(currentService);
+		}
+	}
+	totalServiceCost = totalLabourCost + totalPartsCost;
+	totalServiceCost -= (totalServiceCost * (discountPercentage / 100));
+	Invoice* invoice = Factory::getObject<Invoice>(bookingID, booking, util::Timestamp(), totalLabourCost, completeInventoryItemMapOfBooking, totalPartsCost, discountPercentage, totalServiceCost, util::Timestamp(), util::PaymentMode::NOTSET, util::PaymentStatus::PENDING);
+	util::Map<std::string, Invoice*>& currentInvoices = m_dataStore.getInvoices();
+	currentInvoices.insert(invoice->getId(), invoice);
+}
+
+/*
+Function: getInvoices
+Description: Retrieves all invoices associated with a specific customer.
+Parameters:
+	- customerID: std::string, ID of the customer
+Returns:
+	- util::Map<std::string, Invoice*> containing the customer’s invoices
+*/
+util::Map<std::string, Invoice*> PaymentManagementService::getInvoices(const std::string& customerID)
+{
+	util::Map<std::string, Invoice*>& currentInvoices = m_dataStore.getInvoices();
+	util::Map<std::string, Invoice*> currentUserInvoices;
+	for (int iterator = 0; iterator < currentInvoices.getSize(); iterator++)
+	{
+		Invoice* currentInvoice = currentInvoices.getValueAt(iterator);
+		if (currentInvoice->getBooking()->getCustomerId() == customerID)
+		{
+			currentUserInvoices.insert(currentInvoice->getId(), currentInvoice);
+		}
+	}
+	return currentUserInvoices;
+}
+
+/*
+Function: completePayment
+Description: Completes payment for a specific invoice. Updates payment method, date, and status,
+			 then sends a notification to the customer.
+Parameters:
+	- invoiceID: std::string, ID of the invoice
+	- paymentMode: util::PaymentMode, mode of payment (e.g., ONLINE, OFFLINE)
+Returns:
+	- void
+Throws:
+	- std::runtime_error if the invoice ID is invalid
+*/
+void PaymentManagementService::completePayment(const std::string& invoiceID, util::PaymentMode paymentMode)
+{
+	auto& currentInvoices = m_dataStore.getInvoices();
+	int invoiceIndex = currentInvoices.find(invoiceID);
+	if (invoiceIndex != -1)
+	{
+		Invoice* invoice = currentInvoices.getValueAt(invoiceIndex);
+		if (invoice && invoice->getStatus() != util::PaymentStatus::COMPLETED)
+		{
+			User* currentUser = invoice->getBooking()->getCustomer();
+			invoice->setPaymentMethod(paymentMode);
+			invoice->setPaymentDate(util::Timestamp());
+			invoice->setStatus(util::PaymentStatus::COMPLETED);
+			std::string title, message;
+			title = "Payment successful";
+			message = "Payment successful for invoice ID " + invoiceID;
+			sendNotification(currentUser, title, message);
+		}
+	}
+	else
+	{
+		throw std::runtime_error("Payment failed: invalid invoice ID.");
+	}
 }
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp
index a6b97df..55920d5 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.cpp
@@ -12,17 +12,20 @@ Date:19-May-2026
 #include "ComboPackage.h"
 #include "Config.h"
 #include "DataStore.h"
+#include "Enums.h"
 #include "Factory.h"
 #include "FileManager.h"
 #include "InventoryItem.h"
 #include "JobCard.h"
+#include "NotificationManagementService.h"
+#include "PaymentManagementService.h"
 #include "Service.h"
 #include "ServiceBooking.h"
-#include "ServiceBooking.h"
-
 #include "ServiceManagementService.h"
 #include "Timestamp.h"
+#include "Timestamp.h"
 #include "User.h"
+#include "UserManagementService.h"
 #include "Utility.h"
 
 /*
@@ -725,3 +728,325 @@ void ServiceManagementService::removeComboPackage(const std::string& comboPackag
         throw std::runtime_error("Combo package with ID '" + comboPackageID + "' not found.");
     }
 }
+
+/*
+Function: getServiceBookings
+Description: Retrieves all service bookings from the datastore.
+Parameters:
+	- None
+Returns:
+	- util::Map<std::string, ServiceBooking*> containing all service bookings
+*/
+util::Map<std::string, ServiceBooking*> ServiceManagementService::getServiceBookings()
+{
+	return m_dataStore.getServiceBookings();
+}
+
+/*
+Function: getServiceBooking
+Description: Retrieves a specific service booking by its ID.
+Parameters:
+	- serviceID: std::string, ID of the service booking
+Returns:
+	- ServiceBooking*: Pointer to the service booking, or nullptr if not found
+*/
+ServiceBooking* ServiceManagementService::getServiceBooking(const std::string& serviceID)
+{
+	auto currentServiceBookings = getServiceBookings();
+	for (int iterator = 0; iterator < currentServiceBookings.getSize(); iterator++)
+	{
+		if (currentServiceBookings.getValueAt(iterator)->getId() == serviceID)
+		{
+			return currentServiceBookings.getValueAt(iterator);
+		}
+	}
+	return nullptr;
+}
+
+/*
+Function: createJobCard
+Description: Creates a job card for a given service booking, service, and technician.
+			 Validates booking, service, technician, and inventory availability before creation.
+Parameters:
+	- bookingID: std::string, ID of the service booking
+	- technicianID: std::string, ID of the technician
+	- serviceID: std::string, ID of the service
+Returns:
+	- void
+Throws:
+	- std::runtime_error if booking, service, technician, or inventory validation fails
+*/
+void ServiceManagementService::createJobCard(const std::string& bookingID, const std::string& technicianID, const std::string& serviceID)
+{
+	UserManagementService m_userManagementService;
+	ServiceBooking* currentBooking = getServiceBooking(bookingID);
+	auto& currentJobCards = m_dataStore.getJobCards();
+	if (currentBooking == nullptr)
+	{
+		throw std::runtime_error("Service Booking not available");
+	}
+	auto& currentServices = currentBooking->getServices();
+	if (currentServices.find(serviceID) == -1)
+	{
+		throw std::runtime_error("Invalid service Id");
+	}
+	Service* currentService = currentServices.getValueAt(currentServices.find(serviceID));
+	User* selectedTechnician = m_userManagementService.getUser(technicianID);
+	if (selectedTechnician == nullptr)
+	{
+		throw std::runtime_error("Technician not available");
+	}
+	auto& inventoryItems = currentService->getRequiredInventoryItems();
+	for (int iterator = 0; iterator < inventoryItems.getSize(); iterator++)
+	{
+		InventoryItem* currentInventoryItem = inventoryItems.getValueAt(iterator);
+		if (currentInventoryItem && currentInventoryItem->getQuantity() == 0)
+		{
+			std::string errorMessage = "Failed to create job card, " + currentInventoryItem->getPartName() + " is out of stock.";
+			throw std::runtime_error(errorMessage);
+		}
+	}
+	for (int iterator = 0; iterator < inventoryItems.getSize(); iterator++)
+	{
+		InventoryItem* currentInventoryItem = inventoryItems.getValueAt(iterator);
+		if (currentInventoryItem)
+		{
+			int currentStockQuantity = currentInventoryItem->getQuantity();
+			currentInventoryItem->setQuantity(currentStockQuantity - 1);
+		}
+	}
+	currentBooking->setAssignedTechnician(selectedTechnician);
+	currentBooking->setAssignedTechnicianId(selectedTechnician->getId());
+	std::string title = "Job card created";
+	std::string message = "Job card created for the service and you are assigned for that.";
+	JobCard* jobCard = Factory::getObject<JobCard>(bookingID, currentBooking, currentService, serviceID, technicianID, selectedTechnician, util::Timestamp(), util::ServiceJobStatus::STARTED, util::Timestamp());
+	if (jobCard)
+	{
+		currentJobCards.insert(jobCard->getId(), jobCard);
+		sendNotification(selectedTechnician, title, message);
+	}
+	else
+	{
+		throw std::runtime_error("Failed to create job card.");
+	}
+}
+
+/*
+Function: createService
+Description: Creates a new service with associated inventory items and labor cost.
+			 Validates inventory items before creation.
+Parameters:
+	- name: std::string, name of the service
+	- inventoryItemIDs: util::Vector<std::string>, IDs of required inventory items
+	- laborCost: double, labor cost for the service
+Returns:
+	- void
+Throws:
+	- std::runtime_error if inventory items are not found or service creation fails
+*/
+void ServiceManagementService::createService(const std::string& name, const util::Vector<std::string>& inventoryItemIDs, double laborCost)
+{
+	util::Map<std::string, InventoryItem*> currentServiceInventoryItems;
+	auto inventoryItems = m_dataStore.getInventoryItems();
+	for (int iteratorOne =0; iteratorOne < inventoryItemIDs.getSize(); iteratorOne++)
+	{
+		std::string currentItemID = inventoryItemIDs[iteratorOne];
+		bool itemFound = false;
+		for (int iteratorTwo = 0; iteratorTwo < inventoryItems.getSize(); iteratorTwo++)
+		{
+			InventoryItem* currentInventoryItem = inventoryItems.getValueAt(iteratorTwo);
+			if (currentInventoryItem && currentInventoryItem->getId() == currentItemID)
+			{
+				itemFound = true;
+				currentServiceInventoryItems.insert(currentInventoryItem->getId(), currentInventoryItem);
+				break;
+			}
+		}
+		if (!itemFound)
+		{
+			throw std::runtime_error("Inventory item with ID '" + currentItemID + "' not found.");
+		}
+	}
+	Service* newService = Factory::getObject<Service>(name, currentServiceInventoryItems, laborCost);
+	if (newService == nullptr)
+	{
+		throw std::runtime_error("Unable to create new service.");
+	}
+	util::Map<std::string, Service*>& currentServices = m_dataStore.getServices();
+	if (currentServices.find(newService->getId()) != -1)
+	{
+		throw std::runtime_error("Service with this ID Already exists.");
+	}
+	currentServices.insert(newService->getId(), newService);
+}
+
+/*
+Function: getServices
+Description: Retrieves all services from the datastore.
+Parameters:
+	- None
+Returns:
+	- util::Map<std::string, Service*> containing all services
+*/
+util::Map<std::string, Service*> ServiceManagementService::getServices()
+{
+	return m_dataStore.getServices();
+}
+
+/*
+Function: removeService
+Description: Marks a service as inactive by its ID.
+Parameters:
+	- serviceID: std::string, ID of the service
+Returns:
+	- void
+Throws:
+	- std::runtime_error if the service is not found
+*/
+void ServiceManagementService::removeService(const std::string& serviceID)
+{
+	util::Map<std::string, Service*>& currentServices = m_dataStore.getServices();
+	if (currentServices.find(serviceID) != -1)
+	{
+		currentServices.getValueAt(currentServices.find(serviceID))->setState(util::State::INACTIVE);
+	}
+	else
+	{
+		throw std::runtime_error("Service not found.");
+	}
+}
+
+/*
+Function: getServiceBookings (overloaded)
+Description: Retrieves all service bookings for a specific customer.
+Parameters:
+	- customerID: std::string, ID of the customer
+Returns:
+	- util::Map<std::string, ServiceBooking*> containing bookings for the customer
+*/
+util::Map<std::string, ServiceBooking*> ServiceManagementService::getServiceBookings(const std::string& customerID)
+{
+	util::Map<std::string, ServiceBooking*> currentServiceBookings = getServiceBookings();
+	util::Map<std::string, ServiceBooking*> currentUserServiceBookings;
+	if (currentServiceBookings.getSize() != 0)
+	{
+		for (int iterator = 0; iterator < currentServiceBookings.getSize(); iterator++)
+		{
+			auto currentServiceBooking = currentServiceBookings.getValueAt(iterator);
+			if (currentServiceBooking->getCustomerId() == customerID)
+			{
+				currentUserServiceBookings.insert(currentServiceBooking->getId(), currentServiceBooking);
+			}
+		}
+	}
+	return currentUserServiceBookings;
+}
+
+/*
+Function: getJobCards
+Description: Retrieves all job cards assigned to a specific technician.
+Parameters:
+	- technicianID: std::string, ID of the technician
+Returns:
+	- util::Map<std::string, JobCard*> containing job cards assigned to the technician
+*/
+util::Map<std::string, JobCard*> ServiceManagementService::getJobCards(const std::string& technicianID)
+{
+	util::Map<std::string, JobCard*> jobCards = m_dataStore.getJobCards();
+	util::Map<std::string, JobCard*> technicianJobCards;
+	for (int iterator = 0; iterator < jobCards.getSize(); iterator++)
+	{
+		JobCard* currentJobCard = jobCards.getValueAt(iterator);
+		if (currentJobCard->getTechnicianId() == technicianID)
+		{
+			technicianJobCards.insert(currentJobCard->getId(), currentJobCard);
+		}
+	}
+	return technicianJobCards;
+}
+
+/*
+Function: hasCompletedAllJobs (static helper)
+Description: Checks if all job cards for a given service booking are completed.
+Parameters:
+	- bookingId: std::string, ID of the service booking
+	- currentAssignedJobs: util::Map<std::string, JobCard*>&, map of assigned job cards
+Returns:
+	- bool: True if all job cards are completed, False otherwise
+*/
+static bool hasCompletedAllJobs(std::string bookingId, util::Map<std::string, JobCard*>& currentAssignedJobs)
+{
+	for (int iterator = 0; iterator < currentAssignedJobs.getSize(); iterator++)
+	{
+		JobCard* currentJob = currentAssignedJobs.getValueAt(iterator);
+		if (currentJob->getBookingId() == bookingId)
+		{
+			if (currentJob->getStatus() == util::ServiceJobStatus::STARTED)
+			{
+				return false;
+			}
+		}
+	}
+	return true;
+}
+
+/*
+Function: completeJob
+Description: Marks a job card as completed for the authenticated technician.
+			 If all job cards in the booking are completed, marks the booking as completed
+			 and generates an invoice.
+Parameters:
+	- jobID: std::string, ID of the job card
+Returns:
+	- void
+Throws:
+	- std::runtime_error if technician is not authenticated, job card not found, or job already completed
+*/
+void ServiceManagementService::completeJob(const std::string& jobID)
+{
+	AuthenticationManagementService authenticationManagementService;
+	PaymentManagementService paymentManagementService;
+	bool jobStatusUpdated = false, serviceBookingCompleted;
+	JobCard* currentJob;
+	User* currentTechnician = authenticationManagementService.getAuthenticatedUser();
+	if (currentTechnician == nullptr)
+	{
+		throw std::runtime_error("Unable to fetch current technician.");
+	}
+	util::Map<std::string, JobCard*> currentAssignedJobs = getJobCards(currentTechnician->getId());
+	if (currentAssignedJobs.getSize() == 0)
+	{
+		throw std::runtime_error("No job cards assigned to the technician.");
+	}
+	if (currentAssignedJobs.find(jobID) != -1)
+	{
+		currentJob = currentAssignedJobs.getValueAt(currentAssignedJobs.find(jobID));
+		if (currentJob == nullptr)
+		{
+			throw std::runtime_error("Unable to fetch current job.");
+		}
+		if (currentJob->getStatus() == util::ServiceJobStatus::STARTED)
+		{
+			currentJob->setStatus(util::ServiceJobStatus::COMPLETED);
+			jobStatusUpdated = true;
+		}
+	}
+	else
+	{
+		throw std::runtime_error("Failed to complete the job, some error occured or job already completed.");
+	}
+	if (!jobStatusUpdated)
+	{
+		throw std::runtime_error("Failed to complete the job, some error occured or job already completed.");
+	}
+
+	serviceBookingCompleted = hasCompletedAllJobs(currentJob->getBookingId(), currentAssignedJobs);
+	if (serviceBookingCompleted)
+	{
+		currentJob->getBooking()->setStatus(util::ServiceJobStatus::COMPLETED);
+		paymentManagementService.generateInvoice(currentJob->getBooking());
+		std::string title = "Service Booking completed,Invoice Generated.\n";
+		std::string message = "Services completed for the booking and invoice generated.\n";
+		sendNotification(currentJob->getBooking()->getCustomer(), title, message);
+	}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.h
index bee1dd5..2fdcc93 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/ServiceManagementService.h
@@ -32,6 +32,7 @@ public:
     void purchaseComboPackage(const std::string& comboPackageID, const std::string& vehicleNumber, const std::string& vehicleBrand, const std::string& vehicleModel);
     util::Map<std::string, ServiceBooking*> getServiceBookings();
     util::Map<std::string, ServiceBooking*> getServiceBookings(const std::string& customerID);
+    ServiceBooking* getServiceBooking(const std::string& serviceID);
     void createJobCard(const std::string& bookingID, const std::string& technicianID, const std::string& serviceID);
     void createService(const std::string& name, const util::Vector<std::string>& inventoryItemIDs, double laborCost);
     void removeService(const std::string& serviceID);
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
index 8267144..7518d52 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
@@ -6,6 +6,8 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
+
+#include <stdexcept>
 #include "Config.h"
 #include "Enums.h"
 #include "Factory.h"
@@ -17,7 +19,6 @@ Date:19-May-2026
 #include "User.h"
 #include "UserManagementService.h"
 #include "Vector.h"
-#include <stdexcept>
 
 
 /*
@@ -289,4 +290,33 @@ void UserManagementService::removeUser(const std::string& userID)
 			user->setState(util::State::INACTIVE);
 		}
 	}
-}
\ No newline at end of file
+}
+
+util::Map<std::string, User*> UserManagementService::getUsers(util::UserType type)
+{
+	util::Map<std::string, User*>& currentUsers = m_dataStore.getUsers();
+	util::Map<std::string, User*> filteredUsersMap;
+	for (int iterator = 0; iterator < currentUsers.getSize(); iterator++)
+	{
+		User* currentUser = currentUsers.getValueAt(iterator);
+		if (currentUser->getUserType() == type)
+		{
+			filteredUsersMap.insert(currentUser->getId(), currentUser);
+		}
+	}
+	return filteredUsersMap;
+}
+
+User* UserManagementService::getUser(const std::string& userID)
+{
+	util::Map<std::string, User*>& currentUsers = m_dataStore.getUsers();
+	for (int iterator = 0; iterator < currentUsers.getSize(); iterator++)
+	{
+		User* currentUser = currentUsers.getValueAt(iterator);
+		if (currentUser->getId() == userID)
+		{
+			return currentUser;
+		}
+	}
+	return nullptr;
+}
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Enums.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Enums.h
index c738baa..e410eff 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Enums.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Enums.h
@@ -22,7 +22,8 @@ namespace util
 	enum class PaymentMode
 	{
 		ONLINE,
-		OFFLINE
+		OFFLINE,
+        NOTSET
 	};
 
 	enum class PaymentStatus
@@ -110,6 +111,8 @@ namespace util
             return "ONLINE";
         case PaymentMode::OFFLINE:
             return "OFFLINE";
+        case PaymentMode::NOTSET:
+            return "NOTSET";
         }
         throw std::invalid_argument("Invalid PaymentMode");
     }
@@ -279,4 +282,4 @@ namespace util
         }
         throw std::invalid_argument("Invalid State string");
     }
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Utility.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Utility.h
index 6f473fd..300d5c4 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Utility.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Utility.h
@@ -10,7 +10,6 @@ Date:19-May-2026
 #include "DataStore.h"
 #include "FileHelper.h"
 #include "InventoryItem.h"
-#include "InventoryItem.h"
 #include "NotificationManagementService.h"
 #include "Service.h"
 
@@ -100,4 +99,4 @@ namespace util
         auto observerIDs = service->getObserverIDs();
         util::saveRecords(filePath, observerIDs);
     }
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
index 3c21e74..275b9b0 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/AdminMenu.cpp
@@ -10,14 +10,13 @@ Date: 19-May-2026
 
 #include <iomanip>
 #include <iostream>
-#include "AdminMenu.h"
-#include "ComboPackage.h"
 #include "Enums.h"
 #include "InputHelper.h"
 #include "InventoryItem.h"
 #include "MenuHelper.h"
 #include "OutputHelper.h"
 #include "Service.h"
+#include "ServiceBooking.h"
 #include "User.h"
 #include "Utility.h"
 #include "Validator.h"
@@ -290,16 +289,101 @@ void AdminMenu::checkStockAvailability()
 	util::pressEnter();
 }
 
+/*
+Function: assignJob
+Description: Allows the admin to assign pending service bookings to available technicians.
+			 Creates job cards for selected services.
+Parameters:
+	- None
+Returns:
+	- void
+*/
 void AdminMenu::assignJob()
 {
+	util::clear();
+	std::string selectedService;
+	bool hasPendingService = false;
+	auto currentBookings = m_controller.getServiceBookings();
+	auto availableTechnicians = m_controller.getUsers(util::UserType::TECHNICIAN);
+	int bookingsSize = currentBookings.getSize();
+	util::Map<int, const ServiceBooking*> serviceBookingsMap;
+	util::Map<int, const User*> currentAvailableTechniciansMap;
+	if (listServiceBookings(currentBookings, bookingsSize, serviceBookingsMap))
+	{
+		const ServiceBooking* selectedService = selectPendingServiceBookings(serviceBookingsMap);
+		if (selectedService)
+		{
+			if (availableTechnicians.getSize() != 0)
+			{
+				listAvailableTechnicians(availableTechnicians, availableTechnicians.getSize(), currentAvailableTechniciansMap);
+				const User* selectedTechnician = selectTechnician(currentAvailableTechniciansMap);
+				if (selectedTechnician)
+				{
+					auto& servicesInBooking = selectedService->getServices();
+					for (int iterator = 0; iterator < servicesInBooking.getSize(); iterator++)
+					{
+						m_controller.createJobCard(selectedService->getId(), selectedTechnician->getId(), servicesInBooking.getValueAt(iterator)->getId());
+					}
+				}
+			}
+			else
+			{
+				std::cout << "No technicians are currently available.";
+			}
+		}
+	}
+	util::pressEnter();
 }
 
+/*
+Function: createService
+Description: Allows the admin to create a new service by selecting inventory items and specifying labor cost.
+Parameters:
+	- None
+Returns:
+	- void
+*/
 void AdminMenu::createService()
 {
+	util::clear();
+	std::string serviceName;
+	double labourCost;
+	std::cout << "Enter the service name: ";
+	util::read(serviceName);
+	util::Map<std::string, const InventoryItem*> currentInventoryItems = m_controller.getInventoryItems();
+	util::Vector<std::string> selectedInventoryItems;
+	selectInventoryItems(currentInventoryItems,selectedInventoryItems);
+	std::cout << "Enter the labour cost: ";
+	util::read(labourCost);
+    m_controller.createService(serviceName, selectedInventoryItems, labourCost);
+    std::cout << "Service created sucessfully.\n";
+	util::pressEnter();
 }
 
+/*
+Function: removeService
+Description: Allows the admin to remove an existing service by selecting from available services.
+Parameters:
+	- None
+Returns:
+	- void
+*/
 void AdminMenu::removeService()
 {
+	util::clear();
+	std::string selectedServiceID;
+	util::Map<std::string, const Service*> currentServices = m_controller.getServices();
+	selectedServiceID = selectServicesToRemove(currentServices);
+	if (selectedServiceID != "")
+	{
+		m_controller.removeService(selectedServiceID);
+		std::cout << "Service removed sucessfully.";
+	}
+	else
+	{
+		std::cout << "Failed  to remove service.";
+	}
+	util::pressEnter();
 }
 
 /*
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
index dbbf27c..20f538c 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/CustomerMenu.cpp
@@ -6,15 +6,19 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
+
 #include <iomanip>
 #include "ComboPackage.h"
 #include "CustomerMenu.h"
+#include "Enums.h"
 #include "InputHelper.h"
 #include "InventoryItem.h"
+#include "Invoice.h"
 #include "Map.h"
-#include "MenuHelper.h"
-#include "OutputHelper.h"
 #include "Service.h"
+#include "ServiceBooking.h"
+#include "Timestamp.h"
+#include "User.h"
 #include "Validator.h"
 #include "Vector.h"
 
@@ -223,16 +227,97 @@ void CustomerMenu::selectComboPackage()
     util::pressEnter();
 }
 
+/*
+Function: viewServiceHistory
+Description: Displays the customer’s past service bookings in tabular format,
+             including booking ID, technician, vehicle details, discount percentage, and status.
+Parameters:
+    - None
+Returns:
+    - void
+*/
 void CustomerMenu::viewServiceHistory()
 {
+	util::clear();
+	bool hasServiceHistory = false;
+	const User* currentUser = m_controller.getAuthenticatedUser();
+	std::string currentUserID = currentUser->getId();
+	util::Map<std::string, const ServiceBooking*> serviceBookingsByCurrentUser = m_controller.getServiceBookingsByUser(currentUserID);
+    if (serviceBookingsByCurrentUser.getSize() != 0)
+    {
+        std::cout << std::left
+            << std::setw(12) << "Booking ID"
+            << std::setw(20) << "Technician"
+            << std::setw(15) << "Vehicle Brand"
+            << std::setw(15) << "Vehicle Number"
+            << std::setw(15) << "Vehicle Model"
+            << std::setw(10) << "Discount %"
+            << std::setw(12) << "Status"
+            << std::endl;
+        for (int iterator = 0; iterator < serviceBookingsByCurrentUser.getSize(); iterator++)
+        {
+            const ServiceBooking* currentBooking = serviceBookingsByCurrentUser.getValueAt(iterator);
+            std::string technicianName = currentBooking->getAssignedTechnician() == nullptr
+                ? "Not Assigned"
+                : currentBooking->getAssignedTechnician()->getName();
+            std::cout << std::left
+                << std::setw(12) << currentBooking->getId()
+                << std::setw(20) << technicianName
+                << std::setw(15) << currentBooking->getVehicleBrand()
+                << std::setw(15) << currentBooking->getVehicleNumber()
+                << std::setw(15) << currentBooking->getVehicleModel()
+                << std::setw(10) << currentBooking->getDiscountPercentage()
+                << std::setw(12) << util::getServiceJobStatusString(currentBooking->getStatus())
+                << std::endl;
+            hasServiceHistory = true;
+        }
+    }
+    if (!hasServiceHistory)
+    {
+        std::cout << "No history available." << std::endl;
+    }
+    util::pressEnter();
 }
 
+/*
+Function: completePayments
+Description: Allows the customer to complete pending payments for invoices.
+             Validates invoice selection and payment mode before completing payment.
+Parameters:
+    - None
+Returns:
+    - void
+*/
 void CustomerMenu::completePayments()
 {
+	util::clear();
+	util::Map<std::string, const Invoice*> currentInvoices = m_controller.getInvoicesByUser();
+	std::string selectedID = selectInvoiceFromUserForPayment(currentInvoices);
+    if (selectedID == "")
+    {
+        std::cout << "Payment failed.\n";
+        return;
+    }
+    util::PaymentMode paymentMode = selectPaymentMode();
+    m_controller.completePayment(selectedID, paymentMode);
+    std::cout << "Payment completed successfully.\n";
+    util::pressEnter();
 }
 
+/*
+Function: viewInvoices
+Description: Displays invoices associated with the customer by calling displayInvoices.
+Parameters:
+    - None
+Returns:
+    - void
+*/
 void CustomerMenu::viewInvoices()
 {
+	util::clear();
+	util::Map<std::string, const Invoice*> currentUserInvoices = m_controller.getInvoicesByUser();
+	displayInvoices(currentUserInvoices);
+    util::pressEnter();
 }
 
 /*
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
index 9dfc41d..6dcb97d 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/MenuHelper.h
@@ -8,20 +8,516 @@ Date: 21-May-2026
 */
 
 #pragma once
-#include <iostream>
 #include <iomanip>
+#include <iostream>
 #include <string>
-#include "Utility.h"
+#include "ComboPackage.h"
 #include "Controller.h"
+#include "Enums.h"
 #include "InputHelper.h"
+#include "InventoryItem.h"
+#include "Invoice.h"
+#include "JobCard.h"
 #include "Map.h"
 #include "Notification.h"
 #include "OutputHelper.h"
-#include "Vector.h"
-#include "Validator.h"
 #include "Service.h"
-#include "ComboPackage.h"
+#include "ServiceBooking.h"
+#include "Timestamp.h"
+#include "User.h"
 #include "Utility.h"
+#include "Validator.h"
+#include "Vector.h"
+
+
+/*
+Function: selectServicesToRemove (static helper)
+Description: Allows selection of a service to remove by index.
+Parameters:
+    - currentServices: util::Map<std::string, const Service*>, available services
+Returns:
+    - std::string: ID of the selected service, or empty string if invalid
+*/
+inline std::string selectServicesToRemove(util::Map<std::string, const Service*> currentServices)
+{
+    util::Map<int, const Service*> currentServicesMap;
+    bool hasServices = false;
+    int currentIndex = 1, choice;
+    std::cout << std::left
+        << std::setw(6) << "Index"
+        << std::setw(12) << "Service ID"
+        << std::setw(20) << "Name"
+        << std::setw(10) << "Labor Cost"
+        << std::endl;
+    for (int iterator = 0; iterator < currentServices.getSize(); iterator++)
+    {
+        const Service* currentService = currentServices.getValueAt(iterator);
+        if (currentService->getState() == util::State::INACTIVE)
+        {
+            continue;
+        }
+            std::cout << std::left
+                << std::setw(6) << currentIndex
+            << std::setw(12) << currentService->getId()
+            << std::setw(20) << currentService->getName()
+            << std::setw(10) << currentService->getLaborCost()
+                << std::endl;
+        hasServices = true;
+        currentServicesMap.insert(currentIndex++, currentService);
+        }
+    if (!hasServices)
+    {
+        std::cout << "No services currently available." << std::endl;
+        return "";
+    }
+    std::cout << "Enter your choice: ";
+    util::read(choice);
+    if (currentServicesMap.find(choice) != -1)
+    {
+        return currentServicesMap.getValueAt(currentServicesMap.find(choice))->getId();
+    }
+    else
+{
+        std::cout << "Invalid choice." << std::endl;
+        return "";
+    }
+}
+
+/*
+Function: selectInventoryItems (static helper)
+Description: Allows selection of inventory items by index for creating a service.
+Parameters:
+	- currentInventoryItems: util::Map<std::string, const InventoryItem*>&, available inventory items
+	- selectedInventoryItems: util::Vector<std::string>&, vector to store selected item IDs
+Returns:
+    - void
+*/
+static void selectInventoryItems(util::Map<std::string, const InventoryItem*>& currentInventoryItems, util::Vector<std::string>& selectedInventoryItems)
+{
+	bool doRun = true, hasInventoryItems = false;
+	util::Map<int, const InventoryItem*> currentInventoryMap;
+	int currentIndex = 1;
+	int choice;
+	if (currentInventoryItems.getSize() == 0)
+	{
+		std::cout << "Inventory empty.";
+	}
+	while (doRun)
+{
+		bool hasInventoryItems = false;
+		int currentIndex = 1;
+		currentInventoryMap.clear();
+		std::cout << std::left
+			<< std::setw(6) << "Index"
+			<< std::setw(12) << "Item ID"
+			<< std::setw(20) << "Part Name"
+			<< std::setw(10) << "Price"
+			<< std::setw(10) << "Quantity"
+			<< std::endl;
+		for (int iterator = 0; iterator < currentInventoryItems.getSize(); iterator++)
+    {
+			const InventoryItem* currentInventoryItem = currentInventoryItems.getValueAt(iterator);
+			if (currentInventoryItem->getState() == util::State::INACTIVE)
+        {
+            continue;
+        }
+			std::cout << std::left
+				<< std::setw(6) << currentIndex
+				<< std::setw(12) << currentInventoryItem->getId()
+				<< std::setw(20) << currentInventoryItem->getPartName()
+				<< std::setw(10) << currentInventoryItem->getPrice()
+				<< std::setw(10) << currentInventoryItem->getQuantity()
+				<< std::endl;
+
+			hasInventoryItems = true;
+			currentInventoryMap.insert(currentIndex++, currentInventoryItem);
+		}
+		if (!hasInventoryItems)
+		{
+			std::cout << "No items present in the inventory." << std::endl;
+			doRun = false;
+        break;
+    }
+		std::cout << "Select the item (Index) or enter -1 to exit: ";
+		util::read(choice);
+
+		if (choice == -1)
+{
+			doRun = false;
+        }
+		else if (currentInventoryMap.find(choice) != -1)
+{
+			selectedInventoryItems.push_back(currentInventoryMap.getValueAt(choice)->getId());
+			std::cout << "Item added successfully." << std::endl;
+        }
+        else
+        {
+			std::cout << "Enter a valid integer." << std::endl;
+        }
+    }
+}
+
+/*
+Function: listServiceBookings (static helper)
+Description: Lists all pending service bookings and maps them to indices for selection.
+Parameters:
+	- currentBookings: util::Map<std::string, const ServiceBooking*>&, current bookings
+	- bookingsSize: int&, number of bookings
+	- serviceBookingsMap: util::Map<int, const ServiceBooking*>&, map of indexed bookings
+Returns:
+	- bool: True if pending services exist, False otherwise
+*/
+static bool listServiceBookings(util::Map<std::string, const ServiceBooking*>& currentBookings, int& bookingsSize, util::Map<int, const ServiceBooking*>& serviceBookingsMap)
+{
+    int currentIndex = 1;
+	bool hasPendingService = false;
+    std::cout << std::left
+        << std::setw(10) << "Index"
+		<< std::setw(10) << "ID"
+		<< std::setw(12) << "Status"
+		<< std::setw(12) << "CustID"
+		<< std::setw(20) << "Customer"
+		<< std::setw(15) << "VehicleNo"
+		<< std::setw(15) << "Brand"
+		<< std::setw(15) << "Model"
+		<< std::setw(20) << "Technician"
+		<< std::setw(15) << "TechnicianID"
+        << std::endl;
+	for (int iterator = 0; iterator < bookingsSize; iterator++)
+    {
+		const ServiceBooking* currentBooking = currentBookings.getValueAt(iterator);
+		if (currentBooking && currentBooking->getStatus() == util::ServiceJobStatus::PENDING)
+        {
+			hasPendingService = true;
+			const User* currentAssignedTechnician = currentBooking->getAssignedTechnician();
+        std::cout << std::left
+            << std::setw(10) << currentIndex
+				<< std::setw(10) << currentBooking->getId()
+				<< std::setw(12) << util::getServiceJobStatusString(currentBooking->getStatus())
+				<< std::setw(12) << currentBooking->getCustomerId()
+				<< std::setw(20) << currentBooking->getCustomer()->getName()
+				<< std::setw(15) << currentBooking->getVehicleNumber()
+				<< std::setw(15) << currentBooking->getVehicleBrand()
+				<< std::setw(15) << currentBooking->getVehicleModel()
+				<< std::setw(20) << ((currentAssignedTechnician == nullptr ||  currentAssignedTechnician->getName().empty()) ? "Null" : currentAssignedTechnician->getName())
+				<< std::setw(15) << ((currentAssignedTechnician == nullptr || currentAssignedTechnician->getId().empty()) ? "Null" : currentAssignedTechnician->getId())
+            << std::endl;
+			serviceBookingsMap.insert(currentIndex++, currentBooking);
+    }
+	}
+	if (!hasPendingService)
+    {
+		std::cout << "No pending service available." << std::endl;
+		return false;
+    }
+	return true;
+}
+
+/*
+Function: selectPendingServiceBookings (static helper)
+Description: Allows selection of a pending service booking by index.
+Parameters:
+	- serviceBookingsMap: util::Map<int, const ServiceBooking*>&, map of indexed bookings
+Returns:
+	- const ServiceBooking*: Pointer to the selected booking, or nullptr if invalid
+*/
+static const ServiceBooking* selectPendingServiceBookings(util::Map<int, const ServiceBooking*>& serviceBookingsMap)
+{
+	int userInputIndex;
+	std::cout << "Enter a valid service index: ";
+    util::read(userInputIndex);
+	if (serviceBookingsMap.find(userInputIndex) != -1)
+    {
+		return serviceBookingsMap.getValueAt(userInputIndex);
+	}
+	else
+	{
+		std::cout << "Enter a valid index.";
+        return nullptr;
+    }
+}
+
+/*
+Function: listAvailableTechnicians (static helper)
+Description: Lists all available technicians and maps them to indices for selection.
+Parameters:
+	- currentAvailableTechnicians: util::Map<std::string, const User*>, available technicians
+	- numberOfTechnicians: int, number of technicians
+	- currentAvailableTechniciansMap: util::Map<int, const User*>&, map of indexed technicians
+Returns:
+	- void
+*/
+static void listAvailableTechnicians(util::Map<std::string, const User*> currentAvailableTechnicians, int numberOfTechnicians, util::Map<int, const User*>& currentAvailableTechniciansMap)
+{
+	bool hasTechnicians = false;
+    int currentIndex = 1;
+    std::cout << std::left
+		<< std::setw(6) << "Index"
+		<< std::setw(15) << "Technician ID"
+		<< std::setw(20) << "Name"
+        << std::endl;
+	for (int iterator = 0; iterator < numberOfTechnicians; iterator++)
+    {
+		const User* currentTechnician = currentAvailableTechnicians.getValueAt(iterator);
+		if (currentTechnician->getState() == util::State::INACTIVE)
+        {
+            continue;
+        }
+		hasTechnicians = true;
+        std::cout << std::left
+			<< std::setw(6) << currentIndex
+			<< std::setw(15) << currentTechnician->getId()
+			<< std::setw(20) << currentTechnician->getName()
+            << std::endl;
+		currentAvailableTechniciansMap.insert(currentIndex++, currentTechnician);
+    }
+	if (!hasTechnicians)
+    {
+		std::cout << "No technicians currently available.";
+    }
+}
+
+/*
+Function: selectTechnician (static helper)
+Description: Allows selection of a technician by index.
+Parameters:
+	- currentAvailableTechniciansMap: util::Map<int, const User*>&, map of indexed technicians
+Returns:
+	- const User*: Pointer to the selected technician, or nullptr if invalid
+*/
+static const User* selectTechnician(util::Map<int, const User*>& currentAvailableTechniciansMap)
+    {
+	int userInputIndex;
+	util::read(userInputIndex);
+	if (currentAvailableTechniciansMap.find(userInputIndex) != -1)
+        {
+		return currentAvailableTechniciansMap.getValueAt(userInputIndex);
+        }
+	else
+        {
+		std::cout << "Enter a valid index.";
+		return nullptr;
+    }
+}
+
+/*
+Function: selectInvoiceFromUserForPayment (static helper)
+Description: Lists all pending invoices for the customer and allows selection by index.
+Parameters:
+	- currentInvoices: util::Map<std::string, const Invoice*>&, map of customer invoices
+Returns:
+	- std::string: ID of the selected invoice, or empty string if none selected
+*/
+static std::string selectInvoiceFromUserForPayment(const util::Map<std::string, const Invoice*>& currentInvoices)
+{
+	int currentIndex = 1, choice;
+	util::Map<int, const Invoice*> pendingInvoicesForPayment;
+	std::cout << std::left
+		<< std::setw(6) << "Index"
+		<< std::setw(12) << "BookingID"
+		<< std::setw(15) << "VehicleBrand"
+		<< std::setw(15) << "VehicleNumber"
+		<< std::setw(12) << "TechID"
+		<< std::setw(20) << "TechnicianName"
+		<< std::setw(10) << "Discount(%)"
+		<< std::setw(12) << "TotalAmount"
+		<< std::setw(20) << "InvoiceDate"
+		<< std::endl;
+	for (int iterator = 0; iterator < currentInvoices.getSize(); iterator++)
+	{
+		const Invoice* currentInvoice = currentInvoices.getValueAt(iterator);
+		if (currentInvoice && currentInvoice->getStatus() == util::PaymentStatus::PENDING)
+{
+			const User* currentTechnician = currentInvoice->getBooking()->getAssignedTechnician();
+			std::cout << std::left
+				<< std::setw(6) << currentIndex
+				<< std::setw(12) << currentInvoice->getBookingId()
+				<< std::setw(15) << currentInvoice->getBooking()->getVehicleBrand()
+				<< std::setw(15) << currentInvoice->getBooking()->getVehicleNumber()
+				<< std::setw(12) << ((currentTechnician != nullptr && currentTechnician->getId() != "") ? 
+					currentTechnician->getId() : "Null")
+				<< std::setw(20) << ((currentTechnician != nullptr && currentTechnician->getName() != "") ? 
+					currentTechnician->getName() : "Null")
+				<< std::setw(10) << currentInvoice->getDiscountPercentage()
+				<< std::setw(12) << currentInvoice->getTotalAmount()
+				<< std::setw(20) << currentInvoice->getInvoiceDate().toString()
+				<< std::endl;
+			pendingInvoicesForPayment.insert(currentIndex++, currentInvoice);
+		}
+	}
+	if (pendingInvoicesForPayment.getSize() == 0)
+    {
+		std::cout << "No pending invoices available for payment.\n";
+		return "";
+	}
+	std::cout << "Select the Invoice to pay (Index): ";
+	util::read(choice);
+	int selectedIndex = pendingInvoicesForPayment.find(choice);
+	if (selectedIndex != -1)
+        {
+		const Invoice* selectedInvoice = pendingInvoicesForPayment.getValueAt(selectedIndex);
+		return selectedInvoice->getId();
+        }
+	else
+	{
+		std::cout << "Invalid choice.\n";
+		return "";
+    }
+}
+
+/*
+Function: selectPaymentMode (static helper)
+Description: Allows the customer to select a payment mode (ONLINE or OFFLINE).
+Parameters:
+	- None
+Returns:
+	- util::PaymentMode: Selected payment mode
+*/
+static util::PaymentMode selectPaymentMode()
+{
+	int choice;
+	std::cout << "Enter the payment Mode\n1.OFFLINE\n2.ONLINE\nChoice: ";
+	util::read(choice);
+	if (choice == 1)
+    {
+		std::cout << "Offline mode selected.\n";
+		return util::PaymentMode::OFFLINE;
+	}
+	else if (choice == 2)
+        {
+		std::cout << "Online mode selected.\n";
+		return util::PaymentMode::ONLINE;
+        }
+	else
+	{
+		std::cout << "Invalid choice, Offline mode selected.\n";
+		return util::PaymentMode::OFFLINE;
+    }
+}
+
+/*
+Function: displayInvoices (static helper)
+Description: Displays detailed information for all invoices associated with the customer,
+			 including booking details, technician, discount, total amount, payment status, and items used.
+Parameters:
+	- currentUserInvoices: util::Map<std::string, const Invoice*>, customer’s invoices
+Returns:
+	- void
+Throws:
+	- std::runtime_error if a null invoice is encountered
+*/
+static void displayInvoices(util::Map<std::string, const Invoice*> currentUserInvoices)
+{
+	if (currentUserInvoices.getSize() == 0)
+    {
+		std::cout << "No invoices found for this account." << std::endl;
+		util::pressEnter();
+        return;
+    }
+	else
+    {
+		for (int index = 0; index < currentUserInvoices.getSize(); index++)
+    {
+			const Invoice* currentInvoice = currentUserInvoices.getValueAt(index);
+			if (currentInvoice)
+    {
+				const User* currentTechnician = currentInvoice->getBooking()->getAssignedTechnician();
+				std::cout << "\nInvoice Details\n";
+				std::cout << "Booking ID: " << currentInvoice->getBookingId() << std::endl;
+				std::cout << "Vehicle Brand: " << currentInvoice->getBooking()->getVehicleBrand() << std::endl;
+				std::cout << "Vehicle Number: " << currentInvoice->getBooking()->getVehicleNumber() << std::endl;
+				std::cout << "Technician ID: " <<
+					((currentTechnician != nullptr && currentTechnician->getId() != "") ? 
+						currentTechnician->getId() : "Null") << std::endl;
+				std::cout << "Technician Name: " <<
+					((currentTechnician != nullptr && currentTechnician->getName() != "") ?
+						currentTechnician->getName() : "Null") << std::endl;
+				std::cout << "Discount(%): " << currentInvoice->getDiscountPercentage() << std::endl;
+				std::cout << "Total Amount: " << currentInvoice->getTotalAmount() << std::endl;
+				std::cout << "Invoice Date: " << currentInvoice->getInvoiceDate().toString() << std::endl;
+				std::cout << "Payment Status: " << util::getPaymentStatusString(currentInvoice->getStatus()) << std::endl;
+				auto inventoryItemsInInvoice = currentInvoice->getParts();
+				std::cout << "\nItems Used:\n";
+				std::cout << std::left
+					<< std::setw(20) << "ItemName"
+					<< std::setw(10) << "Quantity"
+					<< std::setw(10) << "Price"
+            << std::endl;
+				std::cout << std::string(40, '-') << std::endl;
+				for (int iterator = 0; iterator < inventoryItemsInInvoice.getSize(); iterator++)
+    {
+					InventoryItem* currentItem = inventoryItemsInInvoice.getValueAt(iterator);
+					std::cout << std::left
+						<< std::setw(20) << currentItem->getPartName()
+						<< std::setw(10) << currentItem->getQuantity()
+						<< std::setw(10) << currentItem->getPrice()
+						<< std::endl;
+    }
+}
+			else
+        {
+				throw std::runtime_error("Null invoice encountered while displaying invoices.");
+				util::pressEnter();
+        }
+        }
+    }
+}
+
+/*
+Function: selectJobCardToComplete (static helper)
+Description: Lists all incomplete job cards assigned to the technician and allows selection by index.
+Parameters:
+	- assignedJobCards: util::Map<std::string, const JobCard*>&, job cards assigned to the technician
+	- incompleteJobCards: util::Map<int, const JobCard*>&, map of incomplete job cards indexed for selection
+Returns:
+	- std::string: ID of the selected job card, or empty string if none selected
+*/
+static std::string selectJobCardToComplete(util::Map<std::string, const JobCard*>& assignedJobCards, util::Map<int, const JobCard*>& incompleteJobCards)
+    {
+	int currentIndex = 1;
+	int choice;
+	bool hasIncompleteJobCard = false;
+	std::cout << std::left
+		<< std::setw(6) << "Index"
+		<< std::setw(12) << "BookingID"
+		<< std::setw(12) << "JobID"
+		<< std::setw(20) << "ServiceName"
+		<< std::setw(12) << "ServiceID"
+		<< std::endl;
+	for (int iterator = 0; iterator < assignedJobCards.getSize(); iterator++)
+    {
+		const JobCard* currentJobCard = assignedJobCards.getValueAt(iterator);
+		if (currentJobCard && (currentJobCard->getStatus() == util::ServiceJobStatus::STARTED))
+        {
+			std::cout << std::left << std::setw(6) << currentIndex
+				<< std::setw(12) << currentJobCard->getBookingId()
+				<< std::setw(12) << currentJobCard->getId()
+				<< std::setw(20) << currentJobCard->getService()->getName()
+				<< std::setw(12) << currentJobCard->getServiceId()
+				<< std::endl;
+			hasIncompleteJobCard = true;
+			incompleteJobCards.insert(currentIndex++, currentJobCard);
+        }
+    }
+	if (!hasIncompleteJobCard)
+    {
+		std::cout << "No pending jobs are present.\n";
+		return "";
+    }
+	std::cout << "Select the Job Card to complete (Index): ";
+    util::read(choice);
+	int selectedJobCardIndex = incompleteJobCards.find(choice);
+	if (selectedJobCardIndex != -1)
+    {
+		const JobCard* selectedJobCard = incompleteJobCards.getValueAt(selectedJobCardIndex);
+		return selectedJobCard->getId();
+    }
+    else
+    {
+		std::cout << "Invalid choice.\n";
+        return "";
+    }
+}
 
 /*
 Function: selectNotification
@@ -106,15 +602,15 @@ Returns:
 inline void viewAndDeleteNotification(Controller& controller)
 {
     util::clear();
-	auto notifications = controller.getNotifications();
-	const Notification* selectedNotification = selectNotification(notifications);
-	if (!selectedNotification)
-	{
-		std::cout << "Failed to display notification!";
-		util::pressEnter();
-		return;
-	}
-	displayNotification(selectedNotification);
+    auto notifications = controller.getNotifications();
+    const Notification* selectedNotification = selectNotification(notifications);
+    if (!selectedNotification)
+    {
+        std::cout << "Failed to display notification!";
+        util::pressEnter();
+        return;
+    }
+    displayNotification(selectedNotification);
     controller.deleteNotification(selectedNotification->getId());
     util::pressEnter();
 }
@@ -526,4 +1022,4 @@ inline std::string selectComboPackage(util::Map<std::string, const ComboPackage*
         std::cout << "Enter a valid choice.\n";
         return "";
     }
-}
+}
\ No newline at end of file
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.cpp
index 3b66a90..7aaddcc 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/TechnicianMenu.cpp
@@ -6,12 +6,14 @@ Description: Implementation file containing the method definitions of the
 Author: Trenser
 Date:19-May-2026
 */
-#include "TechnicianMenu.h"
+#include "Enums.h"
 #include "InputHelper.h"
+#include "JobCard.h"
+#include "MenuHelper.h"
 #include "OutputHelper.h"
+#include "Service.h"
+#include "TechnicianMenu.h"
 #include "Validator.h"
-#include "MenuHelper.h"
-#include "MenuHelper.h"
 
 /*
 Function: showMenu
@@ -79,9 +81,31 @@ bool TechnicianMenu::handleOperation(int choice)
     return true;
 }
 
-
+/*
+Function: completeJob
+Description: Allows the technician to mark a selected job card as completed.
+             Validates selection and updates job status through the controller.
+Parameters:
+    - None
+Returns:
+    - void
+*/
 void TechnicianMenu::completeJob()
 {
+	util::Map<std::string, const JobCard*> assignedJobCards = m_controller.getJobCardsByUser();
+	util::Map<int, const JobCard*> incompleteJobCards;
+	std::cout << "Jobs to be completed.\n";
+	std::string selectedJobID = selectJobCardToComplete(assignedJobCards, incompleteJobCards);
+	if (selectedJobID == "")
+	{
+		std::cout << "Failed to complete the job.\n";
+	}
+	else
+	{
+		m_controller.completeJob(selectedJobID);
+		std::cout << "Job marked as completed.\n";
+	}
+    util::pressEnter();
 }
 
 /*