I will fix rest API, webhook, oauth, cors and third party API integration issues

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gregmarki
G
gregmarki
Greg Marcus
Parte de la información aparece en idioma inglés.
fix rest API, webhook, oauth, cors and third party API integration issues
Pantalla completa
fix rest API, webhook, oauth, cors and third party API integration issues

Acerca de este Servicio

REST API errors, webhook failures, OAuth authentication problems, or CORS issues preventing your application from working? I can help.


I specialize in REST API debugging, webhook troubleshooting, OAuth authentication, CORS error fixes, and third-party API integration for websites, SaaS platforms, mobile apps, and custom web applications. Whether your API is returning authentication errors, failing to sync data, timing out, or breaking after deployment, I'll identify the root cause and deliver a secure, production ready solution.


Services include:

  • REST API debugging & integration
  • Webhook setup and troubleshooting
  • OAuth 2.0 & JWT authentication
  • CORS policy error fixes
  • Third party API integration
  • API request & response debugging
  • JSON & XML data handling
  • API testing with Postman
  • Payment API integration
  • Backend API troubleshooting
  • API performance optimization
  • Payment Gateway Integration
  • CRM & ERP API Integration


I write clean, scalable code, thoroughly test every integration, and keep you updated throughout the project.


Contact me before ordering so I can review your API documentation and recommend the best solution for your application.

  • Experiencia

    • Algoritmos y estructuras de datos
    • Depuración de código
    • Localización
    • Rendimiento
    • Sistemas operativos

  • Lenguaje de programación

    • JavaScript

  • Marco de frontend

    • AngularJS
    • jQuery
    • Next.js
    • React.js
    • Tailwind CSS

  • Marco de backend

    • Laravel
    • Cake PHP
    • FastAPI
    • Next.js
    • Node.js

Conoce a Greg Marcus

Greg Marcus

CUSTOM API DEVELOPMENT AND INTGRATION

  • DeBrasil
  • Miembro desdejul 2026
  • Responde aprox. en:1 hora

  • Idiomas

    Inglés, Portugués, Español, Italiano
I help businesses, startups, and agencies integrate secure payment gateways and powerful API solutions that keep websites and applications running smoothly. My expertise includes Stripe, PayPal, REST API, webhook, custom API integration, payment automation, and third-party API development for WordPress, WooCommerce, Shopify, and custom platforms. I focus on clean, scalable, and reliable solutions tailored to your business goals. If you need seamless integrations or API fixes, feel free to get in touch to discuss your project.

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