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Fiverr Pro
English
$
USD
I will debug and fix your broken rest or soap API integration
Joel M
About this gig
Your integration worked, and now it does not. A 401 that shows up once a day, a webhook that stopped arriving, a SOAP fault nobody can read, a payload the provider swears is correct.
I reproduce the failure first, against your endpoint or sandbox, and find the exact cause before touching code. Every package starts with a written diagnosis: the failing request, the response, the root cause and the fix. Standard and Premium include implementing and verifying that fix.
I work with:
- REST and SOAP/XML APIs, webhooks, OAuth2, API keys
- .NET (C#) and Node.js (TypeScript, JavaScript)
To start I need:
- Which API or system is involved, and its documentation
- What exactly fails: error message, status code or response
- Whether a sandbox or test environment exists
- Example requests and responses or a HAR file, if you have them
I do not need production credentials to start. If the root cause is on the provider's side, the diagnosis proves it, which is exactly what you need to escalate.
Message me before ordering so we can confirm the scope.
Get to know Joel M
Joel M
Automation and integration engineer
- FromNetherlands
- Member sinceSep 2026
- Avg. response time10 hours
Languages
English, Dutch
I spent almost ten years in tech support before I started building software, so I've seen plenty of systems break from the other side of the phone. Now I connect them: CRM automations in HubSpot, Zoho and Pipedrive, workflows in Zapier, Make and n8n, website data scraped into clean spreadsheets, and broken API integrations fixed. I work with AI daily and can wire it into your workflow too.
Most automations work until the day an app changes or goes down. I build for that day too.
Tell me what you need and what you've tried. I'll tell you straight if I can do it, and how long it takes.
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FAQ
Do you need access to my systems?
I prefer not to have production credentials. A sandbox key, a HAR file, or example request and response pairs are usually enough to diagnose. I will tell you up front if I genuinely need more.
What if you cannot fix it?
If the root cause is on the API provider's side and not fixable from your end, you still get the Diagnosis report proving exactly that, which is what you need to escalate to them.
Which languages and stacks do you work in?
C# on .NET, and TypeScript or JavaScript on Node.js. For other stacks I can still diagnose at the HTTP level and hand you the exact fix. Ask before ordering if you need the code change itself in another language.
Should I order Diagnosis or Fix?
If you do not know the cause yet, start with Diagnosis. The report tells you exactly what the fix involves, and I can send you an offer for the fix afterwards.
