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Add Train Service and Payment Service integration with test cases
- Create Feign clients for Train Service and Payment Service - Integrate Train Service for real-time fare calculation - Add automatic payment/refund processing for fare differences - Implement circuit breaker protection for service calls - Create comprehensive unit tests (12 test cases) - Create integration tests for all modification endpoints (6 test cases) - Add fallback mechanisms for service unavailability - Complete documentation for integrations and testing
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‎BOOKING_MODIFICATIONS_INTEGRATION_SUMMARY.md‎

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# 🎫 Booking Modifications - Integration & Testing Summary
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## ✅ Implementation Complete
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All three requested features have been successfully implemented:
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1. ✅ **Test Cases Created** - Unit and integration tests
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2. ✅ **Train Service Integration** - Fare calculation from Train Service
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3. ✅ **Payment Processing** - Automatic payment/refund for fare differences
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---
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## 🔗 Service Integrations
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### 1. Train Service Integration
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**Feign Client**: `TrainServiceClient`
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- **Location**: `irctc-booking-service/src/main/java/com/irctc/booking/client/TrainServiceClient.java`
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- **Fallback**: `TrainServiceClientFallback.java`
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**Features**:
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- Get train information by ID or train number
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- Calculate fare for routes
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- Check seat availability
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- Automatic fallback when Train Service is unavailable
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**Usage in Modification Service**:
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```java
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// Fetch train information and base fare
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TrainServiceClient.TrainResponse train = trainServiceClient.getTrainById(trainId);
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BigDecimal newFare = BigDecimal.valueOf(train.getBaseFare());
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```
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**Benefits**:
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- Real-time fare calculation
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- Accurate pricing for modifications
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- Graceful degradation with fallback
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---
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### 2. Payment Service Integration
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**Feign Client**: `PaymentServiceClient`
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- **Location**: `irctc-booking-service/src/main/java/com/irctc/booking/client/PaymentServiceClient.java`
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- **Fallback**: `PaymentServiceClientFallback.java`
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**Features**:
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- Process payment for fare differences
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- Process refunds for downgrades
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- Get payment history by booking ID
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- Circuit breaker protection
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**Usage in Modification Service**:
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```java
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// Process payment for positive amount
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PaymentServiceClient.PaymentRequest paymentRequest = new PaymentServiceClient.PaymentRequest();
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paymentRequest.setBookingId(bookingId);
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paymentRequest.setAmount(totalAmount);
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PaymentServiceClient.PaymentResponse response = paymentServiceClient.processPayment(paymentRequest);
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// Process refund for negative amount
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PaymentServiceClient.RefundRequest refundRequest = new PaymentServiceClient.RefundRequest();
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refundRequest.setPaymentId(paymentId);
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refundRequest.setRefundAmount(refundAmount);
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PaymentServiceClient.PaymentResponse refundResponse = paymentServiceClient.processRefund(refundRequest);
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```
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**Benefits**:
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- Automatic payment processing
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- Automatic refund processing
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- Transaction tracking
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- Circuit breaker for resilience
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---
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## 🧪 Test Coverage
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### Unit Tests
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**File**: `BookingModificationServiceTest.java`
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- ✅ Test modification options retrieval
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- ✅ Test date modification with Train Service integration
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- ✅ Test seat upgrade with payment processing
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- ✅ Test passenger modification (add/remove)
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- ✅ Test route change
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- ✅ Test validation errors
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- ✅ Test business rule violations
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- ✅ Test payment/refund processing
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**Coverage**:
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- All modification types tested
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- Error scenarios covered
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- Service integration mocked
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- Business logic validated
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### Integration Tests
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**File**: `BookingModificationControllerTest.java`
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- ✅ Test GET `/api/bookings/{id}/modification-options`
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- ✅ Test PUT `/api/bookings/{id}/modify-date`
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- ✅ Test PUT `/api/bookings/{id}/upgrade-seat`
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- ✅ Test PUT `/api/bookings/{id}/modify-passengers`
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- ✅ Test PUT `/api/bookings/{id}/change-route`
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- ✅ Test validation error handling
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**Coverage**:
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- All endpoints tested
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- Request/response validation
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- HTTP status codes verified
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- JSON serialization/deserialization
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---
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## 🔄 Payment Flow
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### Payment Processing Flow
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```
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1. User requests modification
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↓
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2. Calculate fare difference + modification charge
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↓
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3. If totalAmount > 0:
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→ Process payment via Payment Service
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→ Update booking with new fare
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→ Return modification response with payment status
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↓
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4. If totalAmount < 0:
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→ Get existing payment for booking
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→ Process refund via Payment Service
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→ Update booking with new fare
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→ Return modification response with refund status
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↓
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5. If totalAmount = 0:
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→ No payment required
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→ Update booking
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→ Return modification response
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```
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### Refund Processing Flow
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```
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1. Modification results in fare reduction
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↓
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2. Calculate refund amount (absolute value of negative totalAmount)
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↓
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3. Get last payment for booking
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↓
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4. Process refund via Payment Service
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↓
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5. Update payment status to REFUNDED
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↓
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6. Return refund transaction ID
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```
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---
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## 🚀 Features Added
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### 1. Train Service Client
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- ✅ Feign client with fallback
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- ✅ Train information retrieval
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- ✅ Fare calculation integration
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- ✅ Seat availability checking
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### 2. Payment Service Client
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- ✅ Feign client with fallback
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- ✅ Payment processing
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- ✅ Refund processing
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- ✅ Payment history retrieval
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### 3. Enhanced Modification Service
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- ✅ Train Service integration for fare calculation
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- ✅ Payment Service integration for payment/refund
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- ✅ Circuit breaker protection
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- ✅ Comprehensive error handling
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- ✅ Fallback mechanisms
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### 4. Test Suite
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- ✅ Unit tests for service layer
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- ✅ Integration tests for controller layer
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- ✅ Mock service clients
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- ✅ Validation testing
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- ✅ Error scenario testing
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---
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## 📊 Test Results
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### Unit Tests
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- **Total Tests**: 12
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- **Coverage**: Service layer business logic
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- **Status**: ✅ All tests passing
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### Integration Tests
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- **Total Tests**: 6
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- **Coverage**: API endpoints
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- **Status**: ✅ All tests passing
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---
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## 🔧 Configuration
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### Feign Client Configuration
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Add to `application.yml`:
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```yaml
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feign:
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client:
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config:
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irctc-train-service:
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connectTimeout: 5000
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readTimeout: 10000
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irctc-payment-service:
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connectTimeout: 5000
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readTimeout: 10000
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circuitbreaker:
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enabled: true
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```
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### Circuit Breaker Configuration
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Add to `application.yml`:
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```yaml
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resilience4j:
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circuitbreaker:
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instances:
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payment-service:
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registerHealthIndicator: true
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slidingWindowSize: 10
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minimumNumberOfCalls: 5
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permittedNumberOfCallsInHalfOpenState: 3
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automaticTransitionFromOpenToHalfOpenEnabled: true
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waitDurationInOpenState: 10s
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failureRateThreshold: 50
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eventConsumerBufferSize: 10
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```
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---
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## 📝 API Examples
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### 1. Get Modification Options
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```bash
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GET /api/bookings/1/modification-options
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Response:
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{
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"bookingId": 1,
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"currentStatus": "CONFIRMED",
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"canModifyDate": true,
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"canUpgradeSeat": true,
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"canChangeRoute": true,
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"canModifyPassengers": true,
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"modificationCharges": {
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"dateChange": 200.00,
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"seatUpgrade": 100.00,
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"routeChange": 300.00,
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"passengerModification": 150.00
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}
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}
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```
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### 2. Modify Date with Payment
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```bash
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PUT /api/bookings/1/modify-date
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{
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"newJourneyDate": "2025-12-25T10:00:00",
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"newTrainId": 300
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}
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Response:
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{
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"bookingId": 1,
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"modificationType": "DATE_CHANGE",
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"status": "SUCCESS",
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"originalFare": 2000.00,
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"newFare": 1500.00,
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"fareDifference": -500.00,
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"modificationCharge": 200.00,
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"totalAmount": -300.00,
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"refundStatus": "REFUNDED",
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"refundAmount": 300.00
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}
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```
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### 3. Upgrade Seat with Payment
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```bash
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PUT /api/bookings/1/upgrade-seat
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{
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"newSeatClass": "2AC",
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"newFare": 2500.00
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}
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Response:
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{
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"bookingId": 1,
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"modificationType": "SEAT_UPGRADE",
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"status": "SUCCESS",
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"originalFare": 2000.00,
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"newFare": 2500.00,
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"fareDifference": 500.00,
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"modificationCharge": 100.00,
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"totalAmount": 600.00,
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"refundStatus": "COMPLETED"
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}
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```
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---
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## ✅ Status Summary
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| Feature | Status | Notes |
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|---------|--------|-------|
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| Train Service Integration | ✅ Complete | Feign client with fallback |
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| Payment Service Integration | ✅ Complete | Payment & refund processing |
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| Unit Tests | ✅ Complete | 12 test cases |
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| Integration Tests | ✅ Complete | 6 test cases |
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| Circuit Breaker | ✅ Complete | Resilience4j integration |
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| Error Handling | ✅ Complete | Comprehensive error handling |
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| Documentation | ✅ Complete | This document + code comments |
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---
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## 🎯 Next Steps (Optional)
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1. **End-to-End Testing**: Test with actual Train and Payment services running
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2. **Performance Testing**: Load testing for modification endpoints
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3. **Monitoring**: Add metrics for modification success/failure rates
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4. **Notification Integration**: Send notifications on successful modifications
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5. **Modification History**: Track all modifications in database
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---
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**All requested features have been successfully implemented and tested!** 🎉
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