I will secure API integration with oauth2 jwt stripe firebase, supabase auth

W
william_aiwe
W
william_aiwe
William A
secure API integration with oauth2 jwt stripe firebase, supabase auth
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secure API integration with oauth2 jwt stripe firebase, supabase auth
Full Screen
Full Screen
secure API integration with oauth2 jwt stripe firebase, supabase authsecure API integration with oauth2 jwt stripe firebase, supabase authsecure API integration with oauth2 jwt stripe firebase, supabase auth

About this gig

Struggling with broken API integration, OAuth2 authentication, JWT auth, or payment issues?


I will fix and build secure backend systems that actually work in production.


I specialize in API integration, REST API, OAuth2, JWT authentication, Supabase backend, Firebase backend, and Stripe integration for scalable apps and SaaS systems.


Whether you need social login, SSO, secure authentication, or payment gateway integration (Stripe API), I deliver clean, production ready solutions.


  • Secure API integration (REST API, OAuth2, JWT)
  • Firebase & Supabase backend setup
  • Stripe payment gateway integration
  • Authentication systems (SSO, social login, JWT auth)
  • Fast, scalable & secure backend development


I don't just connect APIsI build reliable systems that solve real business problems like failed login flows, payment errors, and broken integrations.


If you need a developer for API integration, authentication, or backend systems, message me and let's fix it fast for you.






api integration (22)oauth2 (15)oauth (13)api (9)jwt (9)supabase (8)rest api (8)firebase (7)stripe api (7)stripe integration (6)spring security (5)jwt auth (5)authentication (5)social login (4)sso (4)integration

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Security
    • Databases
    • Source control

  • Programming language

    • HTML & CSS

  • Frontend framework

    • Angular
    • Backbone.js
    • Flutter
    • Next.js
    • React.js

  • Backend framework

    • Laravel
    • CakePHP
    • Express.js
    • Next.js
    • Node.js

Get to know William A

William A

API Integration Expert, Stripe Shopify REST Webhooks and Backend Developer

  • FromUnited Kingdom
  • Member sinceJan 2026
  • Avg. response time1 hour

  • Languages

    English, German
I help businesses fix website errors, optimize performance, and build reliable API integrations for modern web apps. Specializing in Stripe API, Shopify API, REST APIs, and webhook setup, I create secure, scalable backend systems using PHP, JavaScript, Python, and Firebase or Supabase. From automation workflows to bug fixing and data sync, I deliver clean, efficient solutions designed around your goals. If you need a dependable developer to build, improve, or troubleshoot your system, feel free to reach out for a quick consultation.

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