Idempotent API Design for Mobile Payment Flows

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Learn idempotent API design for mobile payment flows to prevent duplicate transactions and ensure reliable payments

intermediate Published 23 Apr 2026
Action Steps
  1. Implement idempotency keys with server-side deduplication using PostgreSQL upserts
  2. Configure TTL-based cleanup to remove expired idempotency keys
  3. Use OkHttp/Ktor interceptors to attach idempotency headers on the client-side
  4. Apply retry strategies with exponential backoff to handle temporary failures
  5. Implement distributed locking pattern to serialize concurrent duplicate requests
Who Needs to Know This

Backend developers and mobile app developers can benefit from this article to improve the reliability of payment flows and prevent duplicate transactions

Key Insight

💡 Idempotency keys and server-side deduplication can prevent duplicate transactions and improve payment flow reliability

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📈 Ensure reliable mobile payments with idempotent API design! 🚀

Full Article

Deep dive into implementing idempotency keys with server-side deduplication using PostgreSQL upserts and TTL-based cleanup, client-side retry strategies with OkHttp/Ktor interceptors that attach idempotency headers, and the distributed locking pattern that serializes concurrent duplicate requests — with concrete Kotlin examples for both the Ktor backend and Android client
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