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Fiverr Pro
English
$
USD
I will fix your rest API webhook json or integration errors
Emir K
About this gig
Having trouble with a REST API, webhook, JSON payload or third-party integration?
I can help diagnose and fix API and backend integration issues such as:
REST API errors
Webhooks not triggering
Authentication and token issues
400, 401, 403, 404, 422 and 500 errors
JSON/XML request and response problems
Incorrect payloads or data mapping
Timeout and retry issues
Third-party API integrations
Backend debugging and root cause analysis
I focus on identifying the actual cause of the problem and providing a reliable, maintainable solution rather than a temporary workaround.
I work with Ruby on Rails, SQL, Postman, REST APIs, webhooks and backend systems.
Please contact me before ordering if your issue involves multiple systems, undocumented APIs or a complex integration. This helps me confirm the scope and recommend the right package.
Get to know Emir K
Emir K
API Integration, Automation and Backend Troubleshooting Specialist
- FromTurkey
- Member sinceOct 2026
Languages
Turkish, English
I am a software professional with nearly 5 years of experience in backend systems, API integrations and technical troubleshooting. I specialize in REST APIs, webhooks, JSON/XML, authentication issues, SQL and root cause analysis. I can help fix broken integrations, debug API errors and automate repetitive workflows using tools such as Ruby, Postman, n8n and Docker. My focus is on finding the real cause of problems and providing reliable, maintainable solutions.
FAQ
Can you work with an API you have never used before?
Yes. If API documentation or endpoint details are available, I can review the integration, understand the expected behavior and troubleshoot the issue.
Can you fix authentication or token errors?
Yes. I can troubleshoot API keys, bearer tokens, OAuth flows and common 401 or 403 authentication problems.
Can you work with my existing code?
Yes. This Gig is suitable for existing applications. I can review the relevant code, identify the root cause and apply the required fix without rebuilding the whole system.
Should I contact you before placing an order?
Yes, especially for complex integrations, multiple systems or undocumented APIs. A quick message helps confirm the scope and ensures you choose the right package.
