Case Study
Payment Transaction Debugging System
Investigated missing financial transactions by tracing logs across distributed systems and backend services.
JavaSpring BootGCP LoggingSQLRazorpay
Overview
A production issue occurred where users reported missing payment confirmations despite successful transactions.
Problem
- Payment gateway showed success
- Database had no corresponding record
- Users could not see their invoice
This created customer trust issues and a high-priority incident.
Investigation
I traced the transaction lifecycle across systems:
- Payment Gateway (Razorpay)
- Webhook Handler
- Backend Service
- Database
Using:
- Google Cloud Logging
- Transaction ID correlation
- Timestamp analysis
Root Cause
The webhook was received successfully, but backend processing failed during a database write caused by an intermittent timeout.
Solution
- Verified logs across services
- Identified failure point in the processing layer
- Reprocessed affected transactions safely
- Added validation checks for missing records
Improvements
- Introduced better logging visibility
- Suggested retry mechanisms for failed writes
- Improved monitoring for transaction consistency
Impact
- Resolved a critical production issue
- Restored customer confidence
- Reduced future incident resolution time