When using GooglePay for confirming setup or payment intent, MissingPluginException gets thrown.

[elvinasn]

Describe the bug
When using google pay with custom button(instead of using PlatformPayButton, since it does not work with Flutter 3.13 version) the methods confirmPlatformPaySetupIntent and confirmPlatformPayPaymentIntent throws MissingPluginException(No implementation found for method confirmPlatformPay on channel flutter.stripe/payments).

Also, this gets printed:

E/DartMessenger(24014): Uncaught exception in binary message listener
E/DartMessenger(24014): org.json.JSONException: No value for amount
E/DartMessenger(24014): 	at org.json.JSONObject.get(JSONObject.java:399)
E/DartMessenger(24014): 	at org.json.JSONObject.getInt(JSONObject.java:488)
E/DartMessenger(24014): 	at com.facebook.react.bridge.ReadableMap.getInt(ReadableMap.java:49)
E/DartMessenger(24014): 	at com.reactnativestripesdk.GooglePayLauncherFragment.presentGooglePaySheet(GooglePayLauncherFragment.kt:52)
E/DartMessenger(24014): 	at com.reactnativestripesdk.StripeSdkModule.confirmPlatformPay(StripeSdkModule.kt:584)
E/DartMessenger(24014): 	at com.flutter.stripe.StripeAndroidPlugin.onMethodCall(StripeAndroidPlugin.kt:197)
E/DartMessenger(24014): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:258)
E/DartMessenger(24014): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/DartMessenger(24014): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/DartMessenger(24014): 	at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/DartMessenger(24014): 	at android.os.Handler.handleCallback(Handler.java:900)
E/DartMessenger(24014): 	at android.os.Handler.dispatchMessage(Handler.java:103)
E/DartMessenger(24014): 	at android.os.Looper.loop(Looper.java:219)
E/DartMessenger(24014): 	at android.app.ActivityThread.main(ActivityThread.java:8668)
E/DartMessenger(24014): 	at java.lang.reflect.Method.invoke(Native Method)
E/DartMessenger(24014): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
E/DartMessenger(24014): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109)

To Reproduce
Steps to reproduce the behavior:

1. Create setup/payment intent in the backend
2. Use created intent client secret with confirmPlatformPaySetupIntent or confirmPlatformPayPaymentIntent.
3. Get error described.
   Expected behavior
   I expect that the methods work and i get bottom sheet so I can confirm.

Smartphone / tablet

• Device: Huawei P30 Lite
• OS: Android 11
• Package version: 9.5.0+1
• Flutter version 3.13.6
  Additional context

This is the method I call for confirming setup intent:

Future<bool> confirmPlatfromSetupIntent(String clientSecret) async {
    try {
      if (Platform.isAndroid) {
        await _read(stripeProvider).confirmPlatformPaySetupIntent(
          clientSecret: clientSecret,
          confirmParams: const PlatformPayConfirmParams.googlePay(
            googlePay: GooglePayParams(
              merchantName: 'Meetelp',
              allowCreditCards: true,
              isEmailRequired: false,
              testEnv: kDebugMode,
              currencyCode: 'eur',
              merchantCountryCode: 'lt',
            ),
          ),
        );
        return true;
      }
      await _read(stripeProvider).confirmPlatformPaySetupIntent(
        clientSecret: clientSecret,
        confirmParams: const PlatformPayConfirmParams.applePay(
          applePay: ApplePayParams(
            cartItems: [
              ApplePayCartSummaryItem.immediate(
                label: 'Meetelp',
                amount: '0',
              ),
            ],
            merchantCountryCode: 'lt',
            currencyCode: 'eur',
          ),
        ),
      );
      return true;
    } catch (e) {
      log('error: $e');
      return false;
    }
  }

Code for confirming payment intent:

 if (Platform.isIOS) {
        paymentIntent =
            await _read(stripeProvider).confirmPlatformPayPaymentIntent(
          clientSecret: paymentSecret,
          confirmParams: PlatformPayConfirmParams.applePay(
            applePay: ApplePayParams(
              cartItems: [
                ApplePayCartSummaryItem.immediate(
                  label: '$psychologistFullName(via Meetelp)',
                  amount: amount.toString(),
                ),
              ],
              merchantCountryCode: countryCode,
              currencyCode: currency,
            ),
          ),
        );
      } else {

        paymentIntent =
            await _read(stripeProvider).confirmPlatformPayPaymentIntent(
          clientSecret: paymentSecret,
          confirmParams: PlatformPayConfirmParams.googlePay(
            googlePay: GooglePayParams(
              merchantName: '$psychologistFullName(via Meetelp)',
              allowCreditCards: true,
              isEmailRequired: false,
              testEnv: kDebugMode,
              merchantCountryCode: countryCode,
              currencyCode: countryCode,
            ),
          ),
        );
      }

[Rimantovas]

Did you manage to solve this?

[perkuns]

Also having this issue with my side project

[Moyout]

I also encountered the same problem

[favazHF]

Same problem.

Devices: NE2213 | SM-A127F | SM-G988B | Pixel 6a | TECNO KG8, etc!
OSs: Android 9, 11, 12, 13.

Any update?

[HatsuneMikuV]

Same issue.

MissingPluginException(No implementation found for method confirmPlatformPay on channel flutter.stripe/payments)

[DavidEcclesPH]

same:

I/flutter ( 4807): ---------------- CAUGHT EXCEPTION! ----------------
I/flutter ( 4807): MissingPluginException(No implementation found for method confirmPlatformPay on channel flutter.stripe/payments)
I/flutter ( 4807): --------------------------------------------------------

[Rimantovas]

@Moyout Could you tell how you solved the issue? I see you left a thumbs up

[remonh87]

A custom button does not work because there is a lot of internal android code linked to it. I would use the https://github.com/flutter-stripe/flutter_stripe/blob/main/example/lib/screens/wallets/google_pay_screen.dart for now . I will ask the stripe android team for help to debug the issue on flutter.

Let's continue the discussion on #1393 which is the original problem

[elvinasn]

The custom button works with flutter_stripe version 9.3.0.

[Mik77o]

We encounter same issue (9.5.0)

[akrameev-rhino]

The issue is in GooglePayLauncherFragment.kt function presentGooglePaySheet. It tries to get integer value for amount (this.amount = googlePayParams.getInt("amount")) and fails as there is no amount in googlePayParams. Sync from React Native is not always correct (it has amount String value in googlePayParams as it is stated here)

This line is replaced with this.amount = getIntOrNull(googlePayParams, "amount") and should not be a problem in future