How to Add a One-Tap Google Pay Button to Your Flutter App

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A developer tutorial on DEV Community walks through integrating Google Pay into a Flutter application using a single button, requiring no manual card-entry forms. The implementation relies on two Flutter packages — pay_android and google_pay_button — along with a JSON configuration file that specifies the payment gateway, accepted card networks, and environment. The Android project must target a minimum SDK version of 21, and developers need a merchant ID from the Google Pay and Wallet Console for production use. A test environment mode allows developers to simulate the full payment flow with test cards before going live. The guide also covers common setup pitfalls encountered during initial integration with payment processors such as Stripe, Adyen, and Braintree.

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