I will integrate rest API or fix API issues in your web application

Need to connect a payment gateway, SMS service, map, social login, or any other API to your app?

I'm a Senior Full-Stack Engineer with 9+ years of experience integrating third-party services into production applications including payment gateways used by millions of users.

APIs and services I integrate:

Payment gateways Stripe, PayPal, bKash, Nagad, SSLCommerz

Authentication Google, Facebook, GitHub OAuth, Auth0

SMS / Email Twilio, SendGrid, Firebase

Maps Google Maps API, Mapbox

Storage AWS S3, Azure Blob Storage

Any REST or GraphQL API (I read documentation fast)

Webhook setup and handling

OpenAI / Gemini AI API integration

I work with:

ASP.NET Core (C#) backends

React / Next.js frontends

Full-stack .NET + React apps

You get:

Clean, working integration

Error handling and retry logic

Secure API key management

Full explanation of how it works

Message me with the API name and your tech stack I'll confirm I can do it.