A broken gateway costs you money on every order. I test the full payment flow, check API keys, webhook/callback URLs, IPN handling and currency config for Stripe, PayPal, Razorpay or any gateway, fix the failure, and verify a real test payment marks the invoice paid.
Quick Fixes
Verified service · 5.0 rating
WHMCS Payment Gateway Error Fix
Customers can't pay — gateway errors, failed callbacks, or invoices not marking paid? I fix the flow.
Fixed-price quote in 24h
14-day correction guarantee
1 year free support
What's included
Every WHMCS Payment Gateway Error Fix engagement ships with these.
- Test the full checkout + callback flow
- Fix API keys, webhooks and IPN handling
- Verify a test payment marks invoice paid
- Fixed-price quote before any work starts
- Diagnosis + root-cause fix (not a band-aid)
- 14-day correction guarantee
- Plain-English summary of what was wrong
Business outcomes
What hosting operators report after delivery.
- Customers can check out and pay again
- Invoices auto-mark paid — no manual reconciling
Ready to talk about WHMCS Payment Gateway Error Fix?
Quick scoping call, fixed-price quote within 24 hours, no commitment.
Related services
Other WHMCS work hosting operators ask us about.
Quick Fixes
WHMCS Blank Page / White Screen Fix
Admin or client area loading totally blank? I find what is throwing the error and bring it back.
From $49
Quick FixesWHMCS Cron Not Running Fix
Invoices not generating, services not suspending or terminating? Your cron pipeline is broken — I repair it.
From $39
Quick FixesWHMCS License Error Fix
"Curl Error" or license validation failures locking you out? I get WHMCS validating again.
From $39