Production Third-Party API & Payment Integrations
Connecting external services requires more than calling an endpoint. I build resilient, idempotent, and security-hardened integrations for Stripe, Razorpay, WhatsApp Business API, and Google Maps Platform.
Stripe & SaaS Billing Integration
Production-grade Stripe integration for SaaS subscriptions, usage-based metering, checkout sessions, customer portal, and idempotent webhook listeners.
- Stripe Checkout & Elements with custom brand theming
- Tiered, metered, and seat-based SaaS recurring subscriptions
- Stripe Customer Portal integration for self-serve cancellation and invoice downloads
Razorpay & Indian UPI Integration
Robust Razorpay payment integration for India: UPI QR, Google Pay, PhonePe, net banking, recurring auto-debit, and HMAC-SHA256 signature verification.
- Custom Razorpay Standard & Custom Checkout integration
- Native UPI Intent flow for mobile apps (PhonePe, Google Pay, Paytm)
- Razorpay Route for marketplace multi-vendor fund splits
WhatsApp Business Cloud API
Enterprise WhatsApp Business Cloud API integration for automated order alerts, customer support bots, appointment confirmations, and transactional updates.
- Meta WhatsApp Cloud API setup, Business Manager verification & Permanent System User access tokens
- Two-way interactive webhook listener with SHA-256 signature verification (X-Hub-Signature-256)
- High-throughput transactional notifications: OTPs, order updates, invoices, and payment links
Google Maps Platform & Geolocation
High-performance Google Maps integration: Places autocomplete, geocoding, real-time driver tracking, route optimization, and distance calculations.
- Places Autocomplete with session token optimization to reduce API costs by up to 60%
- Forward and reverse geocoding with server-side Redis caching
- Directions API and Distance Matrix for delivery estimation and dispatch routing
Need a Production API or Payment Gateway Integration?
Tell me which third-party service, payment processor, or messaging API you need integrated. I will review your requirements and outline a clean, idempotent architecture.
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