Third-Party API Integration

Seamless integration with payment gateways (Stripe, Razorpay, PayPal), shipping providers (FedEx, UPS), SMS/email services (Twilio, SendGrid), social media APIs (Facebook, Twitter, Instagram), and OAuth authentication. Expert integration services for faster time-to-market.

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EXPERT THIRD-PARTY API INTEGRATION

Building modern applications often requires integrating with multiple third-party services. Our API integration specialists have deep experience connecting your application to payment processors, shipping carriers, communication platforms, social networks, and enterprise systems. We handle the complexity of OAuth flows, webhook processing, error handling, retry logic, and data synchronization—so you can focus on your core business. Whether it's accepting payments with Stripe, sending SMS with Twilio, or syncing data with Salesforce, we deliver production-ready integrations with comprehensive error handling and monitoring.

WHO IT'S FOR

Perfect for e-commerce platforms, SaaS applications, fintech startups, marketing automation tools, CRM systems, logistics platforms, and any business requiring robust third-party service connections.

KEY BENEFITS

/Rapid integration with pre-built connectors
/OAuth 2.0 authentication handling
/Webhook processing with signature verification
/Automatic retry logic for failed requests
/Real-time data synchronization
/Comprehensive error logging and monitoring
/API version management and updates
/Rate limit handling and queue management
/Mock services for testing environments
/Detailed integration documentation

Third-Party API Integration

WHAT'S INCLUDED

Payment Gateway Integration

Stripe, Razorpay, PayPal, Square integration with checkout flows, subscription billing, refunds, webhooks for payment events, PCI compliance, and saved payment methods.

Stripe Payment Processing

Stripe Elements for card input, Payment Intents API, customer management, subscription plans, invoice generation, 3D Secure (SCA), webhook handlers for charge.succeeded, and dispute management.

Razorpay Integration

Razorpay checkout, UPI payments, card/netbanking support, payment links, subscription billing, webhook handlers, refund API, and settlement reporting for Indian businesses.

Shipping API Integration

FedEx, UPS, USPS, DHL integration for rate calculation, label generation, tracking numbers, address validation, international shipping, customs documentation, and shipment webhooks.

SMS & Email Services

Twilio SMS/WhatsApp, SendGrid email, Mailgun SMTP, verification codes, transactional emails, bulk messaging, delivery tracking, unsubscribe management, and template rendering.

Social Media APIs

Facebook Graph API, Twitter API v2, Instagram API, LinkedIn API for social login, profile import, post scheduling, analytics retrieval, and audience insights.

OAuth Authentication

OAuth 2.0 flows (Authorization Code, Client Credentials), PKCE for mobile apps, Google/Facebook/GitHub SSO, token refresh, scope management, and state parameter for CSRF protection.

Webhook Processing

Signature verification (HMAC SHA256), idempotency handling to prevent duplicate events, asynchronous processing with queues, retry logic for failed webhooks, and webhook testing with ngrok.

CRM & ERP Integration

Salesforce, HubSpot, Zoho CRM, SAP, Oracle integration for contact sync, lead management, opportunity tracking, custom field mapping, and bidirectional data flow.

Cloud Storage APIs

AWS S3, Google Cloud Storage, Azure Blob Storage, Cloudinary for file uploads, pre-signed URLs, image transformations, CDN delivery, and secure file access.

Maps & Location Services

Google Maps API, Mapbox, OpenStreetMap for geocoding, reverse geocoding, distance calculation, route optimization, place autocomplete, and static map generation.

AI & ML Service Integration

OpenAI GPT API, Google Cloud AI, AWS Rekognition, sentiment analysis, image recognition, text-to-speech, language translation, and custom model endpoints.

HOW WE DO IT

Requirements Analysis

Identify required third-party services, define integration scope, review API documentation, plan authentication flows, and estimate rate limits and costs.

API Key & OAuth Setup

Create developer accounts, generate API keys, configure OAuth applications, set up webhook endpoints, whitelist redirect URLs, and secure credentials in environment variables.

Integration Development

Implement API clients with error handling, build retry logic with exponential backoff, process webhooks with signature verification, and create data transformation layers.

Testing & Validation

Test with sandbox/test environments, mock third-party responses, validate webhook signatures, test error scenarios, and perform load testing for rate limits.

Monitoring & Logging

Set up error tracking with Sentry, log API requests/responses, monitor rate limit usage, create alerts for failed requests, and build dashboards for integration health.

Documentation & Handoff

Document integration flows, provide API usage examples, create troubleshooting guides, train team on webhook processing, and establish maintenance procedures.

TOOLS & TECHNOLOGIES

Stripe SDK

Razorpay API

PayPal SDK

Twilio API

SendGrid

Mailgun

Axios

Node.js

Python Requests

OAuth 2.0

JWT

Webhooks

Redis Queue

Bull

AWS SQS

Postman

ngrok

Sentry

DataDog

AWS Lambda

Serverless

Docker

PM2

RELATED SERVICES

READY TO GET STARTED?

Let's discuss your project and see how we can help bring your vision to life.

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INTEGRATION EXAMPLES

STRIPE PAYMENT INTEGRATION

// Stripe Payment Intent with Node.js
const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
const express = require('express');

const app = express();
app.use(express.json());

// Create Payment Intent
app.post('/api/create-payment-intent', async (req, res) => {
  try {
    const { amount, currency, customerId, metadata } = req.body;

    const paymentIntent = await stripe.paymentIntents.create({
      amount: amount * 100, // Convert to cents
      currency: currency || 'usd',
      customer: customerId,
      metadata: metadata,
      automatic_payment_methods: {
        enabled: true
      }
    });

    res.json({
      clientSecret: paymentIntent.client_secret,
      paymentIntentId: paymentIntent.id
    });
  } catch (error) {
    res.status(400).json({ error: error.message });
  }
});

// Webhook Handler
app.post('/webhook/stripe',
  express.raw({ type: 'application/json' }),
  async (req, res) => {
    const sig = req.headers['stripe-signature'];
    const webhookSecret = process.env.STRIPE_WEBHOOK_SECRET;

    let event;

    try {
      event = stripe.webhooks.constructEvent(
        req.body,
        sig,
        webhookSecret
      );
    } catch (err) {
      console.error('Webhook signature verification failed:', err.message);
      return res.status(400).send(`Webhook Error: ${err.message}`);
    }

    // Handle event types
    switch (event.type) {
      case 'payment_intent.succeeded':
        const paymentIntent = event.data.object;
        console.log('Payment succeeded:', paymentIntent.id);

        // Update order status in database
        await Order.update(
          { status: 'paid', paymentIntentId: paymentIntent.id },
          { where: { id: paymentIntent.metadata.orderId } }
        );
        break;

      case 'payment_intent.payment_failed':
        const failedPayment = event.data.object;
        console.error('Payment failed:', failedPayment.id);

        // Notify customer
        await sendPaymentFailureEmail(failedPayment.customer);
        break;

      default:
        console.log(`Unhandled event type: ${event.type}`);
    }

    res.json({ received: true });
  }
);

TWILIO SMS INTEGRATION

// Twilio SMS with retry logic
const twilio = require('twilio');
const client = new twilio(
  process.env.TWILIO_ACCOUNT_SID,
  process.env.TWILIO_AUTH_TOKEN
);

// Send SMS with retry
async function sendSMS(to, message, maxRetries = 3) {
  let attempts = 0;

  while (attempts < maxRetries) {
    try {
      const result = await client.messages.create({
        body: message,
        from: process.env.TWILIO_PHONE_NUMBER,
        to: to
      });

      console.log('SMS sent:', result.sid);
      return { success: true, sid: result.sid };

    } catch (error) {
      attempts++;
      console.error(`SMS attempt ${attempts} failed:`, error.message);

      if (attempts >= maxRetries) {
        // Log to error tracking
        await logError('SMS_SEND_FAILED', {
          to,
          error: error.message,
          attempts
        });

        return {
          success: false,
          error: error.message
        };
      }

      // Exponential backoff
      await new Promise(resolve =>
        setTimeout(resolve, Math.pow(2, attempts) * 1000)
      );
    }
  }
}

// Verification code endpoint
app.post('/api/send-verification', async (req, res) => {
  const { phoneNumber } = req.body;

  // Generate 6-digit code
  const code = Math.floor(100000 + Math.random() * 900000);

  // Store in Redis with 5 min expiry
  await redis.setex(
    `verify:${phoneNumber}`,
    300,
    code.toString()
  );

  // Send SMS
  const result = await sendSMS(
    phoneNumber,
    `Your verification code is: ${code}`
  );

  if (result.success) {
    res.json({ message: 'Verification code sent' });
  } else {
    res.status(500).json({ error: 'Failed to send SMS' });
  }
});

// Verify code endpoint
app.post('/api/verify-code', async (req, res) => {
  const { phoneNumber, code } = req.body;

  const storedCode = await redis.get(`verify:${phoneNumber}`);

  if (!storedCode) {
    return res.status(400).json({
      error: 'Code expired or not found'
    });
  }

  if (storedCode === code) {
    await redis.del(`verify:${phoneNumber}`);
    res.json({ success: true, message: 'Phone verified' });
  } else {
    res.status(400).json({ error: 'Invalid code' });
  }
});

OAUTH 2.0 GOOGLE SSO INTEGRATION

// OAuth 2.0 Google Sign-In with Express
const { OAuth2Client } = require('google-auth-library');
const jwt = require('jsonwebtoken');

const client = new OAuth2Client(
  process.env.GOOGLE_CLIENT_ID,
  process.env.GOOGLE_CLIENT_SECRET,
  process.env.GOOGLE_REDIRECT_URI
);

// Initiate OAuth flow
app.get('/auth/google', (req, res) => {
  const authUrl = client.generateAuthUrl({
    access_type: 'offline',
    scope: [
      'https://www.googleapis.com/auth/userinfo.profile',
      'https://www.googleapis.com/auth/userinfo.email'
    ],
    state: generateRandomState() // CSRF protection
  });

  res.redirect(authUrl);
});

// OAuth callback
app.get('/auth/google/callback', async (req, res) => {
  const { code, state } = req.query;

  // Verify state parameter
  if (!verifyState(state)) {
    return res.status(400).json({ error: 'Invalid state parameter' });
  }

  try {
    // Exchange code for tokens
    const { tokens } = await client.getToken(code);
    client.setCredentials(tokens);

    // Get user info
    const ticket = await client.verifyIdToken({
      idToken: tokens.id_token,
      audience: process.env.GOOGLE_CLIENT_ID
    });

    const payload = ticket.getPayload();
    const { sub: googleId, email, name, picture } = payload;

    // Find or create user
    let user = await User.findOne({ where: { googleId } });

    if (!user) {
      user = await User.create({
        googleId,
        email,
        name,
        avatar: picture,
        authProvider: 'google'
      });
    }

    // Generate JWT token
    const jwtToken = jwt.sign(
      { id: user.id, email: user.email },
      process.env.JWT_SECRET,
      { expiresIn: '7d' }
    );

    // Redirect to frontend with token
    res.redirect(`${process.env.FRONTEND_URL}/auth/success?token=${jwtToken}`);

  } catch (error) {
    console.error('OAuth error:', error);
    res.redirect(`${process.env.FRONTEND_URL}/auth/failure`);
  }
});

// Refresh access token
app.post('/auth/refresh-token', async (req, res) => {
  const { refreshToken } = req.body;

  try {
    client.setCredentials({ refresh_token: refreshToken });
    const { credentials } = await client.refreshAccessToken();

    res.json({
      accessToken: credentials.access_token,
      expiresAt: credentials.expiry_date
    });
  } catch (error) {
    res.status(401).json({ error: 'Invalid refresh token' });
  }
});

Third-Party API Integration

EXPERT THIRD-PARTY API INTEGRATION

WHO IT'S FOR

KEY BENEFITS

WHAT'S INCLUDED

Payment Gateway Integration

Stripe Payment Processing

Razorpay Integration

Shipping API Integration

SMS & Email Services

Social Media APIs

OAuth Authentication

Webhook Processing

CRM & ERP Integration

Cloud Storage APIs

Maps & Location Services

AI & ML Service Integration

HOW WE DO IT

Requirements Analysis

API Key & OAuth Setup

Integration Development

Testing & Validation

Monitoring & Logging

Documentation & Handoff

TOOLS & TECHNOLOGIES

RELATED SERVICES

RESTful API Development

Webhook Processing System

Payment Processing Platform

OAuth & SSO Implementation

Microservices Architecture

Data Synchronization

READY TO GET STARTED?

INTEGRATION EXAMPLES

STRIPE PAYMENT INTEGRATION

TWILIO SMS INTEGRATION

OAUTH 2.0 GOOGLE SSO INTEGRATION