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+# DevClub Summer of Code 2024
+
+## App Development: Week 4
+
+### Overview
+Week 4 focuses on integrating key functionalities to enhance the application's capabilities. This includes API calling, payment gateway integration, invoice generation, updating sales data on Firestore, and implementing Firebase Analytics.
+
+### Goals:
+1. Implement HTTP API calls for functionalities like payment confirmations or order tracking.
+2. Integrate a payment gateway into the application for financial transactions.
+3. Enhance the invoice generation process and integrate storage solutions.
+4. Ensure accurate updating of sales data on Firestore after transactions.
+5. Implement Firebase Analytics to monitor user interactions and sales data.
+
+## Tasks:
+
+## Task 1: API Calls
+
+### Objective
+Implement functions to handle API requests including GET, POST, PUT, and DELETE, manage API endpoints, and handle errors and responses.
+
+### Steps
+
+1. **Create API Call Functions:**
+   - Implement functions to make GET, POST, PUT, and DELETE requests using the Flutter HTTP package.
+
+2. **Manage API Endpoints:**
+   - Structure and manage API endpoints effectively.
+
+3. **Error Handling and Response Processing:**
+   - Implement error handling to manage various HTTP errors.
+   - Process responses based on the API structure.
+
+### Resources
+- [Flutter HTTP package documentation](https://pub.dev/packages/http)
+- [Making HTTP Requests in Flutter](https://flutter.dev/docs/cookbook/networking/fetch-data)
+
+## Task 2: Payment Gateway Integration
+
+### Objective
+Integrate a payment gateway to handle financial transactions within the app.
+
+### Steps
+
+1. **Choose a Payment Gateway:**
+   - Decide between Stripe and Razorpay based on features and support.
+
+2. **Integrate the Payment Gateway:**
+   - Implement the chosen payment gateway within the checkout process of the application.
+
+3. **Testing Payment Integration:**
+   - Conduct thorough tests to ensure that the payment process is robust and error-free.
+
+### Resources
+- [Stripe Documentation](https://stripe.com/docs)
+- [Razorpay Documentation](https://razorpay.com/docs/)
+
+## Task 3: Invoice Generation and Management
+
+### Objective
+Streamline the process of invoice generation and storage.
+
+### Steps
+
+1. **Enhance Invoice Generation:**
+   - Generate PDF invoices that include all necessary transaction details.
+
+2. **Implement Invoice Storage:**
+   - Store generated invoices in Firebase Storage securely.
+
+3. **Email Invoices to Customers:**
+   - Set up automatic emailing of invoices to customers after transactions.
+
+### Resources
+- [Firebase Storage Documentation](https://firebase.google.com/docs/storage)
+- [Sending Emails in Flutter](https://pub.dev/packages/flutter_email_sender)
+
+## Task 4: Updating Sales Data on Firestore
+
+### Objective
+Ensure that sales data is accurately updated and synchronized in Firestore.
+
+### Steps
+
+1. **Design Firestore Data Structure:**
+   - Create a comprehensive schema for sales data that supports efficient queries and updates.
+
+2. **Implement Data Update Functionalities:**
+   - Develop functionalities to update sales records on Firestore after each transaction.
+
+3. **Ensure Data Synchronization:**
+   - Implement mechanisms to ensure real-time synchronization of sales data across different parts of the application.
+
+### Resources
+- [Firebase Firestore Documentation](https://firebase.google.com/docs/firestore)
+
+## Task 5: Firebase Analytics Integration
+
+### Objective
+Utilize Firebase Analytics to track user interactions and derive insights from sales data.
+
+### Steps
+
+1. **Set Up Firebase Analytics:**
+   - Integrate Firebase Analytics into your Flutter project.
+
+2. **Define Custom Events:**
+   - Create custom events that help capture essential interactions and sales data.
+
+3. **Analyze and Utilize Data:**
+   - Use the data gathered from Firebase Analytics to make informed decisions about app improvements and marketing strategies.
+
+### Resources
+- [Firebase Analytics Documentation](https://firebase.google.com/docs/analytics)
+- [FlutterFire Analytics Documentation](https://firebase.flutter.dev/docs/analytics/overview/)