How to Integrate Cashfree Payments Into a Flutter App the Right Way

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A developer guide on DEV Community outlines the correct step-by-step process for integrating Cashfree Payments into a Flutter application using the official cashfree_pg SDK. The integration follows a secure backend-first flow where the order and amount are created server-side via the Cashfree API, and only the payment_session_id is passed to the Flutter app. The guide warns against hardcoding client secrets in the app, since Flutter binaries can be decompiled, exposing sensitive credentials to anyone with the APK. Two common integration pitfalls are highlighted: sending the order amount as a decimal (e.g., 149.0 INR) rather than in paise, and including the required customer_details field, which became mandatory in the 2025 API version. Payment verification is handled server-side after checkout, with webhooks recommended for reconciliation.

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