Idempotency in Payment Systems: Preventing Duplicate Transactions Through Database Durability

Network retries and client errors in digital payment systems can trigger duplicate transaction requests, leading to incorrect account balances and financial losses. By implementing idempotency through ACID properties and Write-Ahead Logging, payment platforms ensure each transfer request is processed exactly once, protecting user assets from inconsistencies. This architecture is essential as mobile payment adoption accelerates across platforms like PhonePe, Google Pay, and Paytm.