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Fiverr Pro
English
$
USD
I will fix API integration, API bugs, errors, webhooks and authentication
Regina J
About this gig
Is your API integration broken, returning errors, failing authentication, or not receiving webhooks?
I can help you FIX and integrate APIs correctly.
I specialize in troubleshooting and integrating REST APIs, third party APIs, webhooks, OAuth authentication, JSON data, API endpoints, and backend connections.
I can help with:
- API integration and debugging
- REST API errors
- OAuth and authentication issues
- Webhook setup and troubleshooting
- JSON request and response errors
- 400, 401, 403, 404 and 500 errors
- API timeout and connection problems
- Rate limit handling
- Third party API integration
- Payment and SaaS API integrations
- API testing and data mapping
- Existing API integration fixes
I focus on finding the actual cause of the problem and delivering a clean, tested solution.
Please message me before ordering if your project is complex or requires multiple APIs.
Let's get your API working properly.
Get to know Regina J
Regina J
API Integration And Authentication Bug Fix Specialist
- FromNigeria
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English, Spanish, German, French, Italian
REST API Integration specialist helping you resolve API, webhook, OAuth2, and authentication issues with secure, reliable solutions. I work with startups, SaaS businesses, and growing companies to integrate, debug, and optimize third party APIs, ensuring smooth communication between your systems. You get clean code, dependable performance, and timely delivery tailored to your needs. Ready to fix your API challenges? Send me a message, and let's discuss your project.
FAQ
What APIs can you integrate or fix?
I can work with REST APIs, third party APIs, webhooks, OAuth authentication, JSON APIs, SaaS APIs, payment APIs, and other backend API integrations depending on the project.
Can you fix an existing broken API integration?
Yes. I can troubleshoot API errors, authentication problems, incorrect responses, failed requests, webhook issues, connection problems, and other integration bugs.
Do you work with OAuth and API authentication?
Yes. I can troubleshoot and implement API keys, OAuth authentication, access tokens, refresh tokens, and related authentication flows.
Can you integrate multiple APIs into my application?
Yes. Multiple API integrations can be handled through the Standard or Premium package, depending on the number of endpoints and complexity.
What do you need before starting?
I normally need your API documentation, endpoint details, test credentials or API keys where appropriate, existing code or project files, error messages, and a clear description of what is not working.
