You will get API Debugging Specialist — Fix 401/403 Errors & Authentication Failures
Project details
Are your API requests failing with 401/403 errors, expired tokens, bad signatures, or broken authentication? I will fix it — fast.
I specialize in API debugging, authentication repair, and integration recovery, especially for systems using JWT, OAuth, HMAC, ES256/Ed25519, and custom security layers. If your API “should work” but doesn’t, I will uncover the real cause, apply a verified fix, and deliver a working example you can use immediately.
With deep experience in API engineering, Python, request signing, security headers, and platform-specific quirks, I diagnose issues that normal developers miss — including key formatting mistakes, permission mismatches, invalid signature generation, timestamp drift, and incorrect endpoint paths.
I specialize in API debugging, authentication repair, and integration recovery, especially for systems using JWT, OAuth, HMAC, ES256/Ed25519, and custom security layers. If your API “should work” but doesn’t, I will uncover the real cause, apply a verified fix, and deliver a working example you can use immediately.
With deep experience in API engineering, Python, request signing, security headers, and platform-specific quirks, I diagnose issues that normal developers miss — including key formatting mistakes, permission mismatches, invalid signature generation, timestamp drift, and incorrect endpoint paths.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
SecurityWhat's included
| Service Tiers |
Starter
$95
|
Standard
$245
|
Advanced
$495
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Number of Sources Mined/Scraped | 0 | ||
Install Script | |||
Test Script | |||
Task Automation | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$20 - $40
Task Automation
+$75
API Security Audit
+$75Frequently asked questions
About Craig
Production Payments & Revenue Diagnostics (AI, Fintech, Post-Launch Fa
Houston, United States - 5:35 pm local time
This often happens after AI adoption, automation, or scaling: settlements stall, payouts delay, balances drift, or revenue leaks in ways that didn’t show up in tests.
I specialize in diagnosing post-launch, production-only failures across payments, billing, settlements, escrow, and reconciliation — especially where AI or automation has changed system behavior without triggering obvious errors.
My work is not about building models or adding features. It’s about identifying why revenue is stuck, delayed, missing, or moving inconsistently — and mapping a clear path to resolution.
Clients typically come to me after:
• “Everything works, but the money doesn’t.”
• “Payments succeed, but funds don’t arrive.”
• “Balances don’t reconcile after automation.”
• “AI decisions changed cash flow behavior.”
• “Support says nothing is wrong — but revenue disagrees.”
If your system looks healthy but your revenue tells a different story, you’re not alone — and this is a solvable class of problems.
⸻
What I Help With
• Stalled or delayed settlements
• Missing or inconsistent payouts
• Revenue leakage after AI or automation rollout
• Payment success ≠ money received
• Reconciliation drift between systems
• Escrow or funds locked without a clear resolution path
• Production behavior that diverges from test environments
⸻
How I Work
• Calm, structured diagnosis
• No blame, no theatrics
• Focused on economic reality, not just technical correctness
• Clear findings and next steps you can act on immediately
Most engagements start as a short diagnostic to surface root causes before any larger work is considered.
⸻
Who This Is For
• Founders, CTOs, or finance leads at SMBs
• Teams integrating AI into payments, billing, or finance workflows
• Companies post-launch or post-scale where revenue behavior changed
• Situations where “nothing is broken” — yet money is clearly wrong
⸻
Who This Is Not For
• Pure AI model development
• Chatbots, prompt engineering, or feature builds
• Early-stage prototypes without live revenue
If revenue looks fine on paper but feels wrong in reality, you’re not strange — and you’re allowed to talk about it.
Steps for completing your project
After purchasing the project, send requirements so Craig can start the project.
Delivery time starts when Craig receives requirements from you.
Craig works on your project following the steps below.
Revisions may occur after the delivery date.
Review Client’s API Setup
Check client’s API keys, permissions, environment, headers, request format, and error messages to identify the root cause.