Immediate Flutterwave Gateway Fix

My Flutterwave integration has suddenly stopped processing payments—transactions fail outright instead of moving to “successful.” I need a full-stack developer who can jump in right now, trace the root cause inside the payment processing flow, and restore a 100 % success rate... (Budget: $15 - $25 USD, Jobs: Database Management, Flutter, Full Stack Development, Linux, MySQL, Payment Gateway Integration, PayPal API, PHP)