First Gpay App should be in your android device and second I think in iOS it will not support(2nd for iOS device I am not sure but till now in my implementation it's not working..)
Flutter version:
dependencies:
flutter_stripe: ^4.0.0
You Payment sheet code should be like this in latest way:
await Stripe.instance.initPaymentSheet(
paymentSheetParameters: SetupPaymentSheetParameters(
// Main params
paymentIntentClientSecret: data['paymentIntent'],
merchantDisplayName: 'Flutter Stripe Store Demo',
// Customer params
customerId: data['customer'],
customerEphemeralKeySecret: data['ephemeralKey'],
// Extra params
applePay: PaymentSheetApplePay(
merchantCountryCode: 'DE',
),
googlePay: PaymentSheetGooglePay(
merchantCountryCode: 'DE',
testEnv: true,
),
style: ThemeMode.dark,
appearance: PaymentSheetAppearance(
colors: PaymentSheetAppearanceColors(
background: Colors.lightBlue,
primary: Colors.blue,
componentBorder: Colors.red,
),
shapes: PaymentSheetShape(
borderWidth: 4,
shadow: PaymentSheetShadowParams(color: Colors.red),
),
primaryButton: PaymentSheetPrimaryButtonAppearance(
shapes: PaymentSheetPrimaryButtonShape(blurRadius: 8),
colors: PaymentSheetPrimaryButtonTheme(
light: PaymentSheetPrimaryButtonThemeColors(
background: Color.fromARGB(255, 231, 235, 30),
text: Color.fromARGB(255, 235, 92, 30),
border: Color.fromARGB(255, 235, 92, 30),
),
),
),
),
billingDetails: billingDetails,
),
);