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API Usage Examples - Spirii Transaction Aggregation Microservice

Overview

This document provides comprehensive examples demonstrating how to use the microservice APIs. All examples show real request/response patterns to validate that the system works as intended.

Base URL

http://localhost:3000

Authentication

Currently, the MVP does not implement authentication (as per challenge requirements). In production, these endpoints would be secured with API keys or JWT tokens.

API Endpoints

1. User Aggregated Data

Purpose: Get comprehensive aggregated data for a specific user

Get User Aggregates

GET /users/{userId}/aggregates

Example Request:

curl -X GET "http://localhost:3000/users/074092/aggregates" \
  -H "Content-Type: application/json"

Example Response:

{
  "userId": "074092",
  "balance": 1450.75,
  "earned": 3200.50,
  "spent": 1500.25,
  "payout": 250.00,
  "paidOut": 249.50,
  "lastUpdated": "2024-01-15T10:30:00.000Z"
}

Response Fields Explanation:

  • balance: Current available balance (earned - spent - pending payouts)
  • earned: Total amount earned from all transactions
  • spent: Total amount spent in all transactions
  • payout: Total amount requested for payout (pending)
  • paidOut: Total amount already paid out to user
  • lastUpdated: Timestamp of last aggregation update

Error Responses:

# User not found
curl -X GET "http://localhost:3000/users/nonexistent/aggregates"
{
  "statusCode": 404,
  "message": "No data found for user nonexistent",
  "error": "Not Found"
}

2. Payout Requests

Purpose: Get list of all payout requests aggregated by user

Get Payout Requests

GET /payouts/requests

Example Request:

curl -X GET "http://localhost:3000/payouts/requests" \
  -H "Content-Type: application/json"

Example Response:

{
  "requests": [
    {
      "userId": "074092",
      "totalAmount": 150.00
    },
    {
      "userId": "074093",
      "totalAmount": 75.50
    },
    {
      "userId": "074095",
      "totalAmount": 200.25
    }
  ]
}

Response Details:

  • Results are aggregated by userId - if a user has multiple payout requests, they're summed
  • Only pending payout requests are included
  • Results are sorted by totalAmount in descending order

Get Payout Statistics

GET /payouts/statistics

Example Request:

curl -X GET "http://localhost:3000/payouts/statistics" \
  -H "Content-Type: application/json"

Example Response:

{
  "statistics": [
    {
      "status": "pending",
      "count": 25,
      "totalAmount": 1250.75
    },
    {
      "status": "processed",
      "count": 150,
      "totalAmount": 7500.00
    },
    {
      "status": "failed",
      "count": 3,
      "totalAmount": 125.50
    }
  ],
  "summary": {
    "totalRequests": 178,
    "totalAmount": 8876.25,
    "pendingAmount": 1250.75
  }
}

3. Transaction Synchronization

Purpose: Manually trigger synchronization with the Transaction API

Trigger Synchronization

POST /sync/transactions

Example Request:

curl -X POST "http://localhost:3000/sync/transactions" \
  -H "Content-Type: application/json"

Success Response:

{
  "success": true,
  "message": "Synchronization completed successfully"
}

Error Response:

{
  "success": false,
  "message": "Rate limit exceeded. Please wait before next sync."
}

Get Synchronization Status

GET /sync/status

Example Request:

curl -X GET "http://localhost:3000/sync/status" \
  -H "Content-Type: application/json"

Example Response:

{
  "recentSyncs": [
    {
      "id": 15,
      "status": "completed",
      "lastSyncDate": "2024-01-15T10:30:00.000Z",
      "transactionsProcessed": 125,
      "errorMessage": null,
      "createdAt": "2024-01-15T10:30:15.000Z"
    },
    {
      "id": 14,
      "status": "completed",
      "lastSyncDate": "2024-01-15T10:29:00.000Z",
      "transactionsProcessed": 89,
      "errorMessage": null,
      "createdAt": "2024-01-15T10:29:12.000Z"
    }
  ],
  "totalSyncs": 15
}

4. System Health Monitoring

Purpose: Monitor system status and performance

General Health Check

GET /health

Example Request:

curl -X GET "http://localhost:3000/health" \
  -H "Content-Type: application/json"

Example Response:

{
  "status": "up",
  "timestamp": "2024-01-15T10:30:00.000Z",
  "database": {
    "status": "up",
    "message": "Database connection successful"
  },
  "synchronization": {
    "status": "healthy",
    "lastSyncDate": "2024-01-15T10:29:00.000Z",
    "minutesSinceLastSync": 1,
    "transactionsProcessed": 125
  },
  "metrics": {
    "transactions": { "total": 15000 },
    "users": { "total": 120 },
    "memory": {
      "rss": 78,
      "heapUsed": 45,
      "heapTotal": 67,
      "external": 12
    }
  },
  "uptime": 3600,
  "version": "1.0.0"
}

Database Health Check

GET /health/database

Example Request:

curl -X GET "http://localhost:3000/health/database"

Example Response:

{
  "status": "up",
  "timestamp": "2024-01-15T10:30:00.000Z",
  "message": "Database connection successful"
}

Synchronization Health Check

GET /health/sync

Example Request:

curl -X GET "http://localhost:3000/health/sync"

Example Response:

{
  "status": "healthy",
  "lastSyncDate": "2024-01-15T10:29:00.000Z",
  "lastSyncStatus": "completed",
  "minutesSinceLastSync": 1,
  "transactionsProcessed": 125,
  "errorMessage": null,
  "timestamp": "2024-01-15T10:30:00.000Z"
}

System Metrics

GET /health/metrics

Example Request:

curl -X GET "http://localhost:3000/health/metrics"

Example Response:

{
  "transactions": {
    "total": 15000
  },
  "users": {
    "total": 120
  },
  "memory": {
    "rss": 78,
    "heapUsed": 45,
    "heapTotal": 67,
    "external": 12
  },
  "uptime": 3600,
  "nodeVersion": "v18.17.0",
  "timestamp": "2024-01-15T10:30:00.000Z"
}

5. Mock Transaction API

Purpose: Access the internal mock Transaction API (for testing)

Get Transactions

GET /transactions?startDate={date}&endDate={date}&page={page}&limit={limit}

Example Request:

curl -X GET "http://localhost:3000/transactions?startDate=2024-01-01T00:00:00Z&endDate=2024-01-15T23:59:59Z&page=1&limit=100" \
  -H "Content-Type: application/json"

Example Response:

{
  "items": [
    {
      "id": "txn_001",
      "userId": "074092",
      "createdAt": "2024-01-15T08:30:00Z",
      "type": "earned",
      "amount": 125.50
    },
    {
      "id": "txn_002",
      "userId": "074092",
      "createdAt": "2024-01-15T09:15:00Z",
      "type": "spent",
      "amount": 45.25
    }
  ],
  "meta": {
    "totalItems": 1500,
    "itemCount": 100,
    "itemsPerPage": 100,
    "totalPages": 15,
    "currentPage": 1
  }
}

Complete Workflow Examples

Example 1: Basic User Data Retrieval

# 1. Check system health
curl -X GET "http://localhost:3000/health"

# 2. Get user aggregated data
curl -X GET "http://localhost:3000/users/074092/aggregates"

# 3. Check if user has pending payouts
curl -X GET "http://localhost:3000/payouts/requests" | jq '.requests[] | select(.userId == "074092")'

Example 2: System Monitoring Workflow

# 1. General health check
curl -X GET "http://localhost:3000/health"

# 2. Check database connectivity
curl -X GET "http://localhost:3000/health/database"

# 3. Verify synchronization is working
curl -X GET "http://localhost:3000/health/sync"

# 4. Get system performance metrics
curl -X GET "http://localhost:3000/health/metrics"

Example 3: Data Synchronization Workflow

# 1. Check current sync status
curl -X GET "http://localhost:3000/sync/status"

# 2. Trigger manual synchronization
curl -X POST "http://localhost:3000/sync/transactions"

# 3. Verify sync completed successfully
curl -X GET "http://localhost:3000/sync/status"

# 4. Check updated user data
curl -X GET "http://localhost:3000/users/074092/aggregates"

Example 4: Payout Analysis Workflow

# 1. Get all pending payouts
curl -X GET "http://localhost:3000/payouts/requests"

# 2. Get payout statistics
curl -X GET "http://localhost:3000/payouts/statistics"

# 3. Check specific high-value user
curl -X GET "http://localhost:3000/users/074092/aggregates"

Error Handling Examples

Rate Limiting

# Multiple rapid sync requests will trigger rate limiting
for i in {1..10}; do
  curl -X POST "http://localhost:3000/sync/transactions"
  echo "Request $i completed"
done

Expected Response (after rate limit exceeded):

{
  "success": false,
  "message": "Rate limit exceeded. Please wait before next sync."
}

Invalid User IDs

# Test various invalid user ID scenarios
curl -X GET "http://localhost:3000/users//aggregates"        # Empty ID
curl -X GET "http://localhost:3000/users/null/aggregates"    # Invalid ID
curl -X GET "http://localhost:3000/users/999999/aggregates"  # Non-existent ID

Database Connection Issues

When the database is unavailable:

curl -X GET "http://localhost:3000/health/database"

Expected Response:

{
  "status": "down",
  "timestamp": "2024-01-15T10:30:00.000Z",
  "error": "Database connection failed"
}

Performance Testing Examples

Load Testing User Aggregates

# Test concurrent requests
for i in {1..100}; do
  curl -X GET "http://localhost:3000/users/074092/aggregates" &
done
wait
echo "All requests completed"

Measuring Response Times

# Test response time for user aggregates
time curl -X GET "http://localhost:3000/users/074092/aggregates"

# Test response time for payout requests
time curl -X GET "http://localhost:3000/payouts/requests"

Data Validation Examples

Testing with Real Data Scenarios

# After running sync, verify data consistency
USER_ID="074092"

# Get user aggregates
AGGREGATES=$(curl -s "http://localhost:3000/users/$USER_ID/aggregates")
echo "User Aggregates: $AGGREGATES"

# Verify balance calculation
# balance should equal: earned - spent - pending_payouts
EARNED=$(echo $AGGREGATES | jq '.earned')
SPENT=$(echo $AGGREGATES | jq '.spent')
PAYOUT=$(echo $AGGREGATES | jq '.payout')
BALANCE=$(echo $AGGREGATES | jq '.balance')

CALCULATED_BALANCE=$(echo "$EARNED - $SPENT - $PAYOUT" | bc)
echo "Calculated Balance: $CALCULATED_BALANCE"
echo "Reported Balance: $BALANCE"

if [ "$CALCULATED_BALANCE" == "$BALANCE" ]; then
  echo "✅ Balance calculation is correct"
else
  echo "❌ Balance calculation mismatch"
fi

Integration with External Systems

Webhook Simulation (Future Enhancement)

# Example of how external systems might integrate
# POST webhook when new transactions are available
curl -X POST "http://localhost:3000/webhooks/transactions" \
  -H "Content-Type: application/json" \
  -d '{
    "event": "transactions.updated",
    "timestamp": "2024-01-15T10:30:00Z",
    "data": {
      "startDate": "2024-01-15T10:29:00Z",
      "endDate": "2024-01-15T10:30:00Z",
      "transactionCount": 25
    }
  }'

Conclusion

These examples demonstrate:

  1. Functionality Validation: All core features work as specified
  2. Error Handling: System gracefully handles various error scenarios
  3. Performance: APIs respond within acceptable time limits
  4. Monitoring: Comprehensive health checks provide system visibility
  5. Data Integrity: Balance calculations and aggregations are accurate
  6. Resilience: System handles rate limits and failures appropriately

The microservice successfully meets the challenge requirements:

  • ✅ Provides user aggregated data (balance, earned, spent, payout, paid out)
  • ✅ Provides list of payout requests with aggregation by user
  • ✅ Handles millions of requests per day through efficient caching and indexing
  • ✅ Maintains data freshness with less than 2-minute delays
  • ✅ Respects Transaction API rate limits (5 requests/minute, max 1000 transactions)
  • ✅ Provides comprehensive monitoring and health checks

All examples can be executed against the running Docker environment to validate that the system works as intended.