I will integrate payment gateways, webhooks, or rest apis

S
subashkt
S
subashkt
Subash T
integrate payment gateways, webhooks, or rest apis
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integrate payment gateways, webhooks, or rest apis

About this gig

Need a fast, secure payment gateway or API integration for your web or mobile app?


I am a Full-Stack Engineer with 4+ years of production experience building high-performance backend systems and handling daily transaction volumes of 8,000+. I write clean, well-tested, and secure code.


What I can do for you:

- Payment Gateway Integration: Stripe, Razorpay, Worldline, or custom merchant APIs

- Webhook Listeners: Secure HMAC-signature verification and real-time processing

- REST API Integration: Connecting third-party endpoints, external services, or custom APIs

- Bug Fixing: Resolving CORS issues, authentication/JWT failures, and API payload errors

- Supported Stacks: Node.js, Express, NestJS, Spring Boot, React, Angular, and SQL (MySQL, PostgreSQL)


Why choose this gig?

- 24-hour delivery available for urgent fixes

- Clean, documented code adhering to security best practices

- Direct, transparent communication and thorough testing before delivery


Please send me a message with your requirements or repository details before ordering so we can confirm the scope!

  • Expertise

    • Debugging
    • Localization
    • Performance
    • Security
    • Databases

  • Programming language

    • JavaScript

  • Frontend framework

    • Angular
    • Flutter
    • Next.js
    • React.js
    • Vue.js

  • Backend framework

    • Express.js
    • NestJS
    • Next.js
    • Node.js
    • Spring Boot

Get to know Subash T

Subash T

Full Stack Developer specializing in React and Node and APIs

  • FromIndia
  • Member sinceSep 2026

  • Languages

    Tamil, English
Hi, I’m Subash—a Full-Stack Developer with 4+ years of hands-on experience building production web and mobile apps. I specialize in solving tough technical bugs, integrating third-party APIs (Razorpay, Stripe, Webhooks), and building high-performance backends using React, Angular, Node.js, NestJS, and Spring Boot. Whether you need an urgent bug fix, a Docker deployment setup, database query optimization, or a secure authentication flow (JWT/RBAC), I deliver clean, production-ready code with quick turnaround times. Let's discuss your requirements and get it fixed today!

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