fix checkout analyzer issue

example/lib/screens/checkout/checkout_screen.dart

@@ -1,15 +1,16 @@
 import 'dart:convert';
 import 'dart:developer';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
+import 'package:stripe_checkout/stripe_checkout.dart';
 import 'package:stripe_example/.env.dart';
 import 'package:stripe_example/widgets/example_scaffold.dart';
+
 import '../../config.dart';
 import 'platforms/stripe_checkout.dart'
     if (dart.library.js) 'platforms/stripe_checkout_web.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
-
-import 'package:stripe_checkout/stripe_checkout.dart';
-import 'package:http/http.dart' as http;
 
 class CheckoutScreenExample extends StatefulWidget {
   CheckoutScreenExample({
@@ -49,14 +50,14 @@ class _CheckoutScreenExample extends State<CheckoutScreenExample> {
     );
 
     if (mounted) {
-      final text = result.when(
+      final text = result?.when(
         success: () => 'Paid succesfully',
         canceled: () => 'Checkout canceled',
         error: (e) => 'Error $e',
         redirected: () => 'Redirected succesfully',
       );
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(text)),
+        SnackBar(content: Text(text ?? '')),
       );
     }
   }

example/lib/screens/payment_sheet/payment_sheet_screen.dart

@@ -93,6 +93,7 @@ class _PaymentSheetScreenState extends State<PaymentSheetScreen> {
           // Customer params
           customerId: data['customer'],
           customerEphemeralKeySecret: data['ephemeralKey'],
+
           // Extra params
           primaryButtonLabel: 'Pay now',
           applePay: PaymentSheetApplePay(

example/server/src/index.ts

@@ -549,12 +549,11 @@ app.post('/payment-sheet', async (_, res) => {
   );
   const paymentIntent = await stripe.paymentIntents.create({
     amount: 5099,
-    currency: 'usd',
+    currency: 'eur',
     customer: customer.id,
     // Edit the following to support different payment methods in your PaymentSheet
     // Note: some payment methods have different requirements: https://stripe.com/docs/payments/payment-methods/integration-options
     payment_method_types: [
-      'card',
       // 'ideal',
       // 'sepa_debit',
       // 'sofort',
@@ -563,7 +562,7 @@ app.post('/payment-sheet', async (_, res) => {
       // 'giropay',
       // 'eps',
       // 'afterpay_clearpay',
-      // 'klarna',
+      'klarna',
       // 'us_bank_account',
     ],
   });

packages/stripe/README.md

@@ -47,8 +47,7 @@ dart pub add flutter_stripe
 This plugin requires several changes to be able to work on Android devices. Please make sure you follow all these steps:
 
 1. Use Android 5.0 (API level 21) and above
-2. Use Kotlin version 1.5.0 and above: [example](https://github.com/flutter-stripe/flutter_stripe/blob/79b201a2e9b827196d6a97bb41e1d0e526632a5a/example/android/
-.gradle#L2)
+2. Use Kotlin version 1.5.0 and above: [example](https://github.com/flutter-stripe/flutter_stripe/blob/79b201a2e9b827196d6a97bb41e1d0e526632a5a/example/android/.gradle#L2)
 3. Using a descendant of `Theme.AppCompat` for your activity: [example](https://github.com/flutter-stripe/flutter_stripe/blob/main/example/android/app/src/main/res/values/styles.xml#L15), [example night theme](https://github.com/flutter-stripe/flutter_stripe/blob/main/example/android/app/src/main/res/values-night/styles.xml#L16)
 4. Using an up-to-date Android gradle build tools version: [example](https://github.com/flutter-stripe/flutter_stripe/blob/main/example/android/build.gradle#L9) and an up-to-date gradle version accordingly: [example](https://github.com/flutter-stripe/flutter_stripe/blob/main/example/android/gradle/wrapper/gradle-wrapper.properties#L6) 
 5. Using `FlutterFragmentActivity` instead of `FlutterActivity` in `MainActivity.kt`: [example](https://github.com/flutter-stripe/flutter_stripe/blob/79b201a2e9b827196d6a97bb41e1d0e526632a5a/example/android/app/src/main/kotlin/com/flutter/stripe/example/MainActivity.kt#L6)

packages/stripe/lib/src/widgets/google_pay_button.dart

@@ -33,7 +33,7 @@ class _GooglePayButtonState extends State<GooglePayButton> {
   @override
   void initState() {
     // ignore: deprecated_member_use_from_same_package
-    _creationParams['buttonType'] = describeEnum(widget.type);
+    _creationParams['buttonType'] = widget.type.name;
     _creationParams['type'] = widget.buttonType.id;
 
     super.initState();

packages/stripe_checkout/lib/src/platforms/stripe_checkout_mobile.dart

@@ -0,0 +1,13 @@
+import 'package:flutter/widgets.dart';
+import 'package:stripe_checkout/src/platforms/checkout.dart';
+
+Future<CheckoutResponse?> redirectToCheckout({
+  required BuildContext context,
+  required String sessionId,
+  required String publishableKey,
+  String? stripeAccountId,
+  String? successUrl,
+  String? canceledUrl,
+}) async {
+  return null;
+}

packages/stripe_checkout/lib/stripe_checkout.dart

@@ -1,10 +1,10 @@
 import 'package:flutter/widgets.dart';
 
 import 'src/platforms/checkout.dart';
-import 'src/platforms/stripe_checkout.dart'
+import 'src/platforms/stripe_checkout_mobile.dart'
     if (dart.library.js) 'src/platforms/stripe_checkout_web.dart' as stripe;
 
-Future<CheckoutResponse> redirectToCheckout({
+Future<CheckoutResponse?> redirectToCheckout({
   required BuildContext context,
   required String sessionId,
   required String publishableKey,

packages/stripe_platform_interface/test/test_data.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/foundation.dart';
 import 'package:stripe_platform_interface/stripe_platform_interface.dart';
 
 extension PaymentMethodTestInstance on PaymentMethod {
@@ -94,12 +93,12 @@ extension PaymentIntentTestInstance on PaymentIntent {
         'amount': amount,
         'created': created,
         'currency': currency,
-        'status': describeEnum(status),
+        'status': status.name,
         'clientSecret': clientSecret,
         'livemode': livemode,
         'paymentMethodId': paymentMethodId,
-        'captureMethod': describeEnum(captureMethod),
-        'confirmationMethod': describeEnum(confirmationMethod),
+        'captureMethod': captureMethod.name,
+        'confirmationMethod': confirmationMethod.name,
         'description': description,
         'receiptEmail': receiptEmail,
         'canceledAt': canceledAt,
@@ -124,8 +123,7 @@ extension SetupIntentTestInstance on SetupIntent {
         'clientSecret': clientSecret,
         'paymentMethodId': paymentMethodId,
         'usage': usage,
-        'paymentMethodTypes':
-            paymentMethodTypes.map((e) => describeEnum(e)).toList(),
+        'paymentMethodTypes': paymentMethodTypes.map((e) => e.name).toList(),
         'description': description,
         'created': created,
         'lastSetupError': lastSetupError,
@@ -145,7 +143,7 @@ extension TokenDataTestInstance on TokenData {
         'token': {
           'id': id,
           'livemode': livemode,
-          'type': describeEnum(type),
+          'type': type.name,
           'created': created,
           'card': {
             'brand': card?.brand,