Building Payment-Native Apps with QRIS in Indonesia: Server-Side Verification and Idempotency

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The author argues that payment products in Indonesia should default to QRIS, a single QR standard accepted by all banks and e-wallets, since card-based checkout excludes many users. They describe three products built on QRIS: a balance top-up feature, a Telegram storefront bot, and an ISP that collects subscriber bills. The core principle is that payment success must be decided on the server by re-checking the charge against the provider's API, not trusted from client state or webhook payloads alone. To handle real-world risks, they recommend idempotent webhook handling to prevent double crediting and database transactions with uniqueness constraints to resolve race conditions.

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