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Fiverr Pro
English
$
USD
I will build fastapi rest apis and stripe payment integration
Mojtaba Karimi
About this gig
Need a fast, secure backend API, or Stripe payments that just work?
I build REST APIs in Python with FastAPI, Flask or Django REST framework, and connect them to Stripe and the other services your app uses.
What I can build for you:
- REST API endpoints with input validation and clear error messages
- Stripe one-time payments, refunds and signed webhooks
- Connections to Shopify, HubSpot, OpenAI or any documented REST API
- PostgreSQL database models and migrations
- User login with JWT tokens and role-based access
- Fixes for broken Stripe or API code
Built to be safe and reliable:
- Webhook signatures checked, so fake payment events are rejected
- No double charges when a request is retried
- Automated tests and interactive API docs (Swagger)
- Clean, commented code that you own
How it works:
1. Tell me what your API should do and what it connects to
2. I confirm the plan and the list of endpoints
3. I build, test and deliver with a setup guide
Also available as a custom offer: Docker deployment, more endpoints, background jobs, monthly maintenance.
Message me with your project and I will suggest the right package.
https://github.com/mojtaba-py-code
Get to know Mojtaba Karimi
Mojtaba Karimi
Python AI Developer, LLM Integration, Web Scraping, Automation
- FromTurkey
- Member sinceMay 2026
- Avg. response time2 hours
Languages
English, Persian
I'm a Python AI developer who builds reliable business tools. I connect OpenAI and other LLM APIs to your data for summaries, alerts and data extraction, with personal data masked and every AI answer checked before it reaches you. I also integrate Stripe payments and webhooks, scrape websites (including JavaScript pages) into clean CSV, Excel or JSON, and automate repetitive work so it runs on its own. I build with FastAPI and PostgreSQL, write automated tests for every project, and handle errors so nothing fails silently. My public projects pass more than 4,400 automated tests.
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FAQ
What do you need from me to start?
A short description of what the API should do, the services it connects to (Stripe, Shopify, your CRM), your preferred framework and test API keys. If you have existing code, share the repository. Never send live keys in the order form.
Which framework do you use?
FastAPI by default, because it is fast and creates interactive API docs automatically. If your project already uses Flask or Django REST framework, I work inside your existing code.
What counts as an "endpoint"?
One URL and method, for example POST /orders or GET /orders/{id}. Basic covers up to 3, Standard 8 and Premium 20. Need more? Add Extra 5 Endpoints at checkout.
Which Stripe features do you set up?
One-time payments, refunds and webhooks, with signature checks and protection against double charges. I test everything in Stripe test mode first, then help you switch to your live keys.
Can you fix my existing Stripe or API code?
Yes, that is the Basic package. Share the files or repository and the error you see. I find the cause, fix it and add a test so the same bug does not come back.
Which APIs can you integrate?
Any API with documentation: Stripe, Shopify, HubSpot, OpenAI, shipping or SMS providers, or your own internal APIs. Send me the API docs link and I will confirm before you order.
Do you build the frontend too?
No. I focus on the backend: the API, the database and the integrations. You get clear API docs, so your frontend developer or app can connect easily.
How do you keep payments secure?
Secret keys stay in environment variables, never in the code. Webhooks are verified with Stripe's signature, amounts are checked on the server, and every payment step is logged and tested.
Do I get the source code and docs?
Yes. Every package includes the full source code, a README with setup steps and interactive API docs (Swagger), so you own everything with no lock-in.
Do you offer calls?
I work through Fiverr messages, which keeps every decision in writing. For complex projects I send a short recorded video walkthrough instead of a call, so you can watch it any time.
