API Integration & Development

API Integration & Development Services India — Connect Your Business Ecosystem

CVDN Technology's API integration and development services help businesses connect disparate systems and third-party platforms into a unified, automated workflow. We design and build RESTful APIs, GraphQL APIs, and WebSocket connections for real-time communication, and we integrate hundreds of third-party APIs including payment gateways, SMS/email providers, government portals (GST, MCA, DigiLocker, Aadhaar), logistics APIs, and social media platforms.

Our API development process emphasises security, documentation, and performance from the outset. Every API we build includes JWT or OAuth 2.0 authentication, rate limiting to prevent abuse, comprehensive error handling, and full Swagger documentation. We also specialise in legacy system integration — connecting older software that lacks a native API using middleware connectors, SFTP file transfer bridges, or database-level integration.

CVDN has built custom integrations for Tally ERP, logistics platforms like Delhivery and Shiprocket, and custom government portals — helping clients automate workflows that previously required dedicated data-entry staff to manage manually.

• RESTful API design to OpenAPI 3.0 specification with Swagger UI
• OAuth 2.0, JWT, and API key authentication patterns
• Payment gateway: Razorpay, PayU, Stripe, CCAvenue
• Government API: GST, MCA, Aadhaar, DigiLocker, PAN verification
• Logistics API: Delhivery, Shiprocket, BlueDart, India Post
• Webhook development and event-driven architecture design