How to Integrate PayPal Android SDK into Flutter Apps Using Platform Channels

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Flutter developers can integrate the PayPal Android SDK without a dedicated Dart package by using platform channels to bridge Dart and Kotlin code. The integration relies on Braintree's PayPal module, as the older PayPalNativeCheckout module has been deprecated. A MethodChannel connects Flutter's Dart layer to Android's native MainActivity, where the PayPal client and launcher are initialized with a client authorization token and an app-link return URL. Developers are advised never to store private credentials on the mobile client and to always verify payment status through a backend server before fulfilling any order. The tutorial recommends confirming the current Braintree SDK version and reviewing migration guidance before deploying to production.

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