You will get your broken webhook or OAuth API integration diagnosed and fixed
Project details
Webhook returning 401 or 403, OAuth token refresh failing, or provider retries creating duplicate events?
I will diagnose a clearly scoped API integration problem and deliver evidence you can reproduce. Good fits include:
• HMAC or webhook signature verification
• OAuth access-token refresh and 401 retry handling
• Duplicate callbacks, replay protection, and idempotency
• Request/response mapping, validation, timeouts, and actionable errors
• A documented third-party REST API integration
My workflow is evidence-driven: reproduce the failure, capture it in a focused test or request, identify the root cause, apply the smallest safe fix included in your tier, run regression checks, and provide source code or a patch with test evidence and written handoff notes.
Please provide sanitized logs, reproduction steps, API/provider documentation, runtime versions, and a repository or minimal example after the contract starts.
Not included: production operations, undocumented scraping, bypassing provider restrictions, new frontend screens, major architecture changes, data recovery, or third-party subscription and API fees. New systems or changed requirements need a separate milestone.
I will diagnose a clearly scoped API integration problem and deliver evidence you can reproduce. Good fits include:
• HMAC or webhook signature verification
• OAuth access-token refresh and 401 retry handling
• Duplicate callbacks, replay protection, and idempotency
• Request/response mapping, validation, timeouts, and actionable errors
• A documented third-party REST API integration
My workflow is evidence-driven: reproduce the failure, capture it in a focused test or request, identify the root cause, apply the smallest safe fix included in your tier, run regression checks, and provide source code or a patch with test evidence and written handoff notes.
Please provide sanitized logs, reproduction steps, API/provider documentation, runtime versions, and a repository or minimal example after the contract starts.
Not included: production operations, undocumented scraping, bypassing provider restrictions, new frontend screens, major architecture changes, data recovery, or third-party subscription and API fees. New systems or changed requirements need a separate milestone.
Programming Languages
JavaScript, Python, JavaCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$59
|
Standard
$149
|
Advanced
$299
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 1 | 1 |
Number of Pages | 1 | 1 | 1 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Zhikai
API Integration & Spring Boot Troubleshooter | Webhooks, OAuth
Hangzhou, China - 11:46 am local time
I have 5+ years of professional backend experience with Java, Spring Boot, REST APIs, SQL databases, JPA/Hibernate, and system integrations.
Good-fit projects:
- Repair webhook signatures, retries, duplicate events, and error handling
- Fix OAuth token refresh or a documented third-party API integration
- Diagnose Spring Boot REST API, JPA, transaction, validation, or security failures
- Build a Postman collection with positive and negative regression checks
- Add or modify a focused endpoint, business rule, or data-processing workflow
My workflow is evidence-driven: confirm the expected result, reproduce the issue, capture it in a failing test or request, implement the smallest maintainable fix, run regression checks, and deliver source code with setup steps, test evidence, and known limitations.
I work well through asynchronous written communication and provide concise progress updates. For a quick scope check, send the current behavior, expected result, relevant versions, sanitized logs, reproduction steps, and API documentation.
Steps for completing your project
After purchasing the project, send requirements so Zhikai can start the project.
Delivery time starts when Zhikai receives requirements from you.
Zhikai works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce and isolate the failure
I run the supplied steps, capture a failing test or request, and confirm the smallest agreed scope before modifying code.
Implement the smallest safe repair
I fix the contained webhook, OAuth, or REST API defect and add focused regression checks for the agreed behavior.