We will see the steps to install the flutter stripe package in Flutter and be able to use the Stripe API within the app in Flutter.

We will see the steps to install the flutter stripe package in Flutter and be able to use the Stripe API within the Flutter app.

We install the dependency that we are going to use by:

pubspec.yaml

dependencies:
 ***
 flutter_stripe:

The official page:

https://pub.dev/packages/flutter_stripe

Gradle version change

It is important to note that the plugin requires several configurations, specifically it uses Gradle level 8 which may involve applying several additional configurations.

The steps to initialize the above plugin are as follows:

Use Android 5.0 (API level 21) and above.
Use Kotlin version 1.8.0 and above: example
Requires Android Gradle plugin 8 and higher
Using a descendant of Theme.AppCompat for your activity: example, example night theme
Using an up-to-date Android gradle build tools version: example and an up-to-date gradle version accordingly: example
Using FlutterFragmentActivity instead of FlutterActivity in MainActivity.kt: example
Add the following rules to your proguard-rules.pro file: example

The above is an extract from what is shown in the official documentation.

It may be that your project does not have the latest versions of Gradle, so you should check and correct them if necessary; for this, we modify:

android/gradle/wrapper/gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-7.x.x-all.zip

For any version 8 available, for this, you can enter the previous page:

https://services.gradle.org/distributions

And copy some from version 8, for example:

android/gradle/wrapper/gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-8.3-all.zip

Kotlin version change

We also need to upload the Kotlin version:

android/settings.gradle

plugins {
   ***
   id "org.jetbrains.kotlin.android" version "1.8.0" apply false
}

If you do not configure any of the previous steps, when implementing the widget to make the payment as we will see in the next section, you will see an error like the following on the screen:

Stripe exception: PlatformException(flutter_stripe initialization failed, The plugin failed to initialize: Your theme isn't set to use Theme.AppCompat or Theme.MaterialComponents. Please make sure you follow all the steps detailed inside the README: https://github.com/flutter-stripe/ flutter_stripe#android If you continue to have trouble, follow this discussion to get some support https://github.com/flutter-stripe/ flutter_stripe/discussions/538, null, null

This error is generic and will usually occur if you make a mistake in any of the steps required to configure the plugin in a project.

Other changes

We added the following rules:

android\app\proguard-rules.pro

-dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivity$g
-dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivityStarter$Args
-dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivityStarter$Error
-dontwarn com.stripe.android.pushProvisioning.PushProvisioningActivityStarter
-dontwarn com.stripe.android.pushProvisioning.PushProvisioningEphemeralKeyProvider