WebSocket Support

Overview

Transaction API provides WebSocket support for real-time payment updates. This allows you to receive instant notifications about payment status changes without polling the API.

Connection

WebSocket URL

wss://api.transaction.gg/ws

Authentication

Include your JWT token in the connection query parameter:

const ws = new WebSocket('wss://api.transaction.gg/ws?token=your_jwt_token');

Connection Management

Basic Connection

class TransactionWebSocket {
  constructor(token) {
    this.token = token;
    this.ws = null;
    this.reconnectAttempts = 0;
    this.maxReconnectAttempts = 5;
  }
  
  connect() {
    this.ws = new WebSocket(`wss://api.transaction.gg/ws?token=${this.token}`);
    
    this.ws.onopen = () => {
      console.log('WebSocket connected');
      this.reconnectAttempts = 0;
    };
    
    this.ws.onmessage = (event) => {
      const data = JSON.parse(event.data);
      this.handleMessage(data);
    };
    
    this.ws.onclose = () => {
      console.log('WebSocket disconnected');
      this.handleReconnect();
    };
    
    this.ws.onerror = (error) => {
      console.error('WebSocket error:', error);
    };
  }
  
  handleMessage(data) {
    switch (data.event) {
      case 'payment.status_update':
        this.handlePaymentUpdate(data);
        break;
      case 'payment.completed':
        this.handlePaymentCompleted(data);
        break;
      case 'payment.expired':
        this.handlePaymentExpired(data);
        break;
      default:
        console.log('Unknown event:', data.event);
    }
  }
  
  handleReconnect() {
    if (this.reconnectAttempts < this.maxReconnectAttempts) {
      this.reconnectAttempts++;
      const delay = Math.pow(2, this.reconnectAttempts) * 1000;
      
      setTimeout(() => {
        console.log(`Reconnecting... (attempt ${this.reconnectAttempts})`);
        this.connect();
      }, delay);
    }
  }
}

Advanced Connection with Heartbeat

class AdvancedTransactionWebSocket extends TransactionWebSocket {
  constructor(token) {
    super(token);
    this.heartbeatInterval = null;
    this.pingInterval = 30000; // 30 seconds
  }
  
  connect() {
    super.connect();
    
    this.ws.onopen = () => {
      console.log('WebSocket connected');
      this.reconnectAttempts = 0;
      this.startHeartbeat();
    };
    
    this.ws.onclose = () => {
      console.log('WebSocket disconnected');
      this.stopHeartbeat();
      this.handleReconnect();
    };
  }
  
  startHeartbeat() {
    this.heartbeatInterval = setInterval(() => {
      if (this.ws.readyState === WebSocket.OPEN) {
        this.ws.send(JSON.stringify({ type: 'ping' }));
      }
    }, this.pingInterval);
  }
  
  stopHeartbeat() {
    if (this.heartbeatInterval) {
      clearInterval(this.heartbeatInterval);
      this.heartbeatInterval = null;
    }
  }
}

Supported Events

Payment Status Update

{
  "event": "payment.status_update",
  "payment": {
    "id": "pay_abc123def456",
    "status": "pending",
    "amountCrypto": "0.00012345",
    "crypto": "BTC",
    "address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
    "confirmations": 2,
    "requiredConfirmations": 3
  },
  "timestamp": "2024-01-01T00:15:00Z"
}

Payment Completed

{
  "event": "payment.completed",
  "payment": {
    "id": "pay_abc123def456",
    "status": "completed",
    "amountCrypto": "0.00012345",
    "crypto": "BTC",
    "address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
    "incomingTxHash": "abc123...",
    "completedAt": "2024-01-01T00:30:00Z",
    "customerId": "cus_V6n6SN2KnsIFCuQU",
    "orderId": "order_123"
  },
  "timestamp": "2024-01-01T00:30:00Z"
}

Payment Expired

{
  "event": "payment.expired",
  "payment": {
    "id": "pay_abc123def456",
    "status": "expired",
    "expiresAt": "2024-01-01T01:00:00Z"
  },
  "timestamp": "2024-01-01T01:00:00Z"
}

Event Handling

Payment Status Updates

handlePaymentUpdate(data) {
  const payment = data.payment;
  
  // Update UI with new status
  this.updatePaymentStatus(payment.id, payment.status);
  
  // Show confirmation progress
  if (payment.confirmations && payment.requiredConfirmations) {
    const progress = (payment.confirmations / payment.requiredConfirmations) * 100;
    this.updateConfirmationProgress(payment.id, progress);
  }
}

Payment Completion

handlePaymentCompleted(data) {
  const payment = data.payment;
  
  // Update order status
  this.updateOrderStatus(payment.orderId, 'completed');
  
  // Send confirmation email
  this.sendConfirmationEmail(payment.customerId);
  
  // Redirect to success page
  this.redirectToSuccess(payment.orderId);
}

Payment Expiration

handlePaymentExpired(data) {
  const payment = data.payment;
  
  // Update order status
  this.updateOrderStatus(payment.orderId, 'expired');
  
  // Show expiration message
  this.showExpirationMessage(payment.id);
  
  // Offer retry option
  this.offerPaymentRetry(payment.orderId);
}

React Integration

Custom Hook

import { useState, useEffect, useRef } from 'react';

function useTransactionWebSocket(token) {
  const [connectionStatus, setConnectionStatus] = useState('disconnected');
  const [payments, setPayments] = useState({});
  const wsRef = useRef(null);
  
  useEffect(() => {
    if (!token) return;
    
    const ws = new WebSocket(`wss://api.transaction.gg/ws?token=${token}`);
    wsRef.current = ws;
    
    ws.onopen = () => {
      setConnectionStatus('connected');
    };
    
    ws.onmessage = (event) => {
      const data = JSON.parse(event.data);
      
      if (data.event === 'payment.status_update') {
        setPayments(prev => ({
          ...prev,
          [data.payment.id]: data.payment
        }));
      }
    };
    
    ws.onclose = () => {
      setConnectionStatus('disconnected');
    };
    
    return () => {
      ws.close();
    };
  }, [token]);
  
  return { connectionStatus, payments };
}

Component Usage

function PaymentTracker({ paymentId, token }) {
  const { connectionStatus, payments } = useTransactionWebSocket(token);
  const payment = payments[paymentId];
  
  if (connectionStatus === 'disconnected') {
    return <div>Connecting to real-time updates...</div>;
  }
  
  if (!payment) {
    return <div>Loading payment...</div>;
  }
  
  return (
    <div>
      <h3>Payment Status: {payment.status}</h3>
      {payment.confirmations && (
        <div>
          Confirmations: {payment.confirmations}/{payment.requiredConfirmations}
        </div>
      )}
    </div>
  );
}

Error Handling

Connection Errors

class WebSocketErrorHandler {
  constructor(ws) {
    this.ws = ws;
    this.setupErrorHandling();
  }
  
  setupErrorHandling() {
    this.ws.onerror = (error) => {
      console.error('WebSocket error:', error);
      this.handleError(error);
    };
    
    this.ws.onclose = (event) => {
      if (!event.wasClean) {
        console.error('WebSocket closed unexpectedly:', event.code, event.reason);
        this.handleUnexpectedClose(event);
      }
    };
  }
  
  handleError(error) {
    // Log error for debugging
    console.error('WebSocket error details:', error);
    
    // Attempt to reconnect
    this.attemptReconnect();
  }
  
  handleUnexpectedClose(event) {
    // Handle different close codes
    switch (event.code) {
      case 1006: // Abnormal closure
        this.attemptReconnect();
        break;
      case 1011: // Server error
        this.handleServerError();
        break;
      default:
        this.handleGenericClose(event);
    }
  }
}

Best Practices

Connection Management

Implement Reconnection

Always implement automatic reconnection for production applications.

Handle Connection States

Track connection status and show appropriate UI feedback.

Use Heartbeats

Implement ping/pong to detect dead connections.

Graceful Degradation

Fall back to polling if WebSocket connection fails.

Performance Optimization

// Throttle updates to prevent UI flooding
class ThrottledWebSocket extends TransactionWebSocket {
  constructor(token, throttleMs = 1000) {
    super(token);
    this.throttleMs = throttleMs;
    this.updateQueue = [];
    this.throttleTimer = null;
  }
  
  handleMessage(data) {
    this.updateQueue.push(data);
    
    if (!this.throttleTimer) {
      this.throttleTimer = setTimeout(() => {
        this.processUpdateQueue();
        this.throttleTimer = null;
      }, this.throttleMs);
    }
  }
  
  processUpdateQueue() {
    // Process all queued updates
    this.updateQueue.forEach(data => super.handleMessage(data));
    this.updateQueue = [];
  }
}

WebSocket vs Webhooks

WebSocket

Best for:

Real-time UI updates
Client-side applications
Interactive dashboards
Mobile apps

Pros:

Real-time updates
Low latency
Persistent connection

Webhooks

Best for:

Server-to-server communication
Backend processing
Reliable delivery
Audit trails

Pros:

Reliable delivery
Retry mechanism
Server-side processing
Better for critical operations

Testing WebSocket Connections

Local Testing

// Test WebSocket connection locally
function testWebSocketConnection() {
  const ws = new WebSocket('wss://api.transaction.gg/ws?token=test_token');
  
  ws.onopen = () => {
    console.log('✅ WebSocket connected successfully');
  };
  
  ws.onmessage = (event) => {
    console.log('📨 Received message:', JSON.parse(event.data));
  };
  
  ws.onerror = (error) => {
    console.error('❌ WebSocket error:', error);
  };
  
  ws.onclose = (event) => {
    console.log('🔌 WebSocket closed:', event.code, event.reason);
  };
}

Production Monitoring

// Monitor WebSocket health in production
class WebSocketMonitor {
  constructor(ws) {
    this.ws = ws;
    this.metrics = {
      messagesReceived: 0,
      connectionUptime: 0,
      lastMessageTime: null
    };
    
    this.startMonitoring();
  }
  
  startMonitoring() {
    setInterval(() => {
      this.checkConnectionHealth();
    }, 30000); // Check every 30 seconds
  }
  
  checkConnectionHealth() {
    const now = Date.now();
    const timeSinceLastMessage = now - this.metrics.lastMessageTime;
    
    if (timeSinceLastMessage > 60000) { // 1 minute
      console.warn('No messages received in the last minute');
    }
  }
}

Production Tip: Use both WebSocket and webhooks for critical applications. WebSocket for real-time UI updates and webhooks for reliable server-side processing.

Getting started

Essentials

Integration

Overview

Connection

WebSocket URL

Authentication

Connection Management

Basic Connection

Advanced Connection with Heartbeat

Supported Events

Payment Status Update

Payment Completed

Payment Expired

Event Handling

Payment Status Updates

Payment Completion

Payment Expiration

React Integration

Custom Hook

Component Usage

Error Handling

Connection Errors

Best Practices

Connection Management

Performance Optimization

WebSocket vs Webhooks

WebSocket

Webhooks

Testing WebSocket Connections

Local Testing

Production Monitoring

Getting started

Essentials

Integration

​Overview

​Connection

​WebSocket URL

​Authentication

​Connection Management

​Basic Connection

​Advanced Connection with Heartbeat

​Supported Events

​Payment Status Update

​Payment Completed

​Payment Expired

​Event Handling

​Payment Status Updates

​Payment Completion

​Payment Expiration

​React Integration

​Custom Hook

​Component Usage

​Error Handling

​Connection Errors

​Best Practices

​Connection Management

​Performance Optimization

​WebSocket vs Webhooks

WebSocket

Webhooks

​Testing WebSocket Connections

​Local Testing

​Production Monitoring

Overview

Connection

WebSocket URL

Authentication

Connection Management

Basic Connection

Advanced Connection with Heartbeat

Supported Events

Payment Status Update

Payment Completed

Payment Expired

Event Handling

Payment Status Updates

Payment Completion

Payment Expiration

React Integration

Custom Hook

Component Usage

Error Handling

Connection Errors

Best Practices

Connection Management

Performance Optimization

WebSocket vs Webhooks

Testing WebSocket Connections

Local Testing

Production Monitoring