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Fiverr Pro
English
$
USD
I will fix API integration errors, 401, 403, 429, webhook and authentication issues
Zavier
About this gig
Is your API integration not working as expected? Are you dealing with authentication errors, failed webhooks, incorrect responses, or REST API connection problems?
I can help troubleshoot and fix common API integration issues and get your systems communicating correctly.
My service can help with:
- API integration errors and connection issues
- REST API troubleshooting
- 401, 403 and 429 errors
- API authentication and authorization issues
- Webhook setup and troubleshooting
- JSON request and response problems
- API data mapping issues
- Postman API testing
- Third-party API integration
- API debugging and error diagnosis
My approach is simple: I review the issue, identify the likely cause, implement the appropriate fix, and test the integration to make sure it works as expected.
Please contact me before ordering if your issue is complex or requires a specific API, so we can confirm the requirements first.
Let's get your API integration working properly.
Get to know Zavier
Zavier
API Integration Expert
- FromNigeria
- Member sinceJul 2026
- Avg. response time3 hours
Languages
English
I help businesses connect their apps and services through reliable API integrations. I can build, connect, test, and troubleshoot REST APIs, webhooks, third-party APIs, and custom integrations. Whether your API is failing, two platforms aren't communicating, or you need a new integration, I'll work to find the cause and deliver a clean, practical solution that works.
FAQ
What API problems can you fix?
I can troubleshoot REST API errors, authentication issues, webhooks, JSON problems, API connections, data mapping, and common 401, 403, and 429 errors.
Which APIs can you work with?
I can work with APIs that provide accessible documentation and the necessary testing information. Please message me with the API name and issue before ordering.
Can you fix webhook problems?
Yes. I can investigate webhook configuration, request handling, failed deliveries, and related integration issues.
Do you work with Postman?
Yes. I can use Postman to test API requests, responses, authentication, headers, parameters, and endpoints.
What do you need from me to start?
I'll need the API documentation, a clear description of the problem, relevant error messages or logs, and any safe test credentials or access required for troubleshooting.
Can you work with an existing API integration?
Yes. I can review an existing integration, identify the problem, and make appropriate changes based on the available code and API documentation.
Will you provide the updated source code?
Yes, when source code is included in the selected package, I'll provide the relevant updated files or code.
Can you guarantee that my API will be fixed?
I can diagnose and work on the issue based on the information and access provided, but I can't guarantee a specific outcome before reviewing the API, code, and problem.
