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I will fix api integration, stripe webhook, fastapi and nodejs bugs
Mahin
About this gig
Dealing with a failing 400/500 API error, broken Stripe payment webhooks, or need a clean third-party API integrated into your app today?
I specialize in fast, reliable REST API integrations, Stripe billing webhooks, and backend troubleshooting using Python (FastAPI), Node.js, Next.js, and PostgreSQL/Supabase.
What I Can Fix or Build for You:
- Urgent API & Webhook Debugging: Fix 400/401/403/500 errors, CORS blocks, OAuth2 token refresh bugs, and malformed JSON payloads.
- Stripe Payment & Subscription Flows: Stripe Checkout, Customer Portal, recurring billing, Stripe Connect split payments, and idempotent webhook listeners.
- Third-Party API Connections: Connect OpenAI, Twilio, HubSpot, Shopify, SendGrid, Google APIs, or custom REST/GraphQL endpoints to your frontend or database.
- Clean Backend Endpoints: Build fast, documented FastAPI or Node.js/Express routes connected to Supabase, PostgreSQL, or MongoDB.
Included in Every Order:
- Clean, well-commented code & Postman/Insomnia test verification
- 7 days of free post-delivery support
Send me your error log or API docs before orderingI reply within 15 minutes!
Get to know Mahin
Mahin
n8n and Make Workflow Automation and AI Agent Specialist
- FromBangladesh
- Member sinceJan 2023
- Avg. response time1 hour
Languages
Bengali, English, Hindi
Hi, I'm Mahin. I build reliable AI automations, custom AI agents, and API integrations that save your team hours of manual work every week. I connect the tools businesses rely on daily: n8n, Make.com, Zapier, Vapi, Retell AI, OpenAI, Claude, GoHighLevel, HubSpot, Airtable, and Supabase. Whether you need a broken webhook fixed today, an automated CRM lead pipeline, or a 24/7 AI voice and chat agent, I build clean workflows that work in production. Every order includes documentation and a video walkthrough. Message me your workflow idea or error to get started!
Other Software Development Services I Offer
FAQ
I have a broken API call, CORS issue, or failing Stripe webhook right now. How fast can you fix it?
Select the Basic package (1-day delivery) or message me your error log first—I typically resolve single API, OAuth2, or webhook signature bugs within a few hours.
Which backend frameworks and databases do you work with?
I work with Python (FastAPI, Flask), Node.js (Express), Next.js API routes, PostgreSQL, Supabase, MongoDB, and Airtable.
How do you test and verify that the API integration works safely?
Every endpoint and webhook is tested end-to-end using Postman/Insomnia and Stripe CLI test events, with proper error handling and idempotency checks so duplicate events never occur.
Do you provide support after the code is delivered?
Yes! Every order includes clean, commented code, a verification log/video, and 7 days of free post-delivery support.
