fix: handle setupIntent response key in collectBankAccount and verifyMicrodeposits

When isPaymentIntent is false, the native SDK returns the result under
the 'setupIntent' key, but the Dart method channel handler always looked
for 'paymentIntent', causing a parsing failure.

Extract a shared _parseIntentResult helper that checks isPaymentIntent
and uses the correct response key. For setup intents, construct a
PaymentIntent from the setup intent data to satisfy the platform
interface contract.

Author: BiAksoy

packages/stripe_platform_interface/lib/src/method_channel_stripe.dart

@@ -14,6 +14,7 @@ import 'package:stripe_platform_interface/src/models/wallet.dart';
 import 'package:stripe_platform_interface/src/result_parser.dart';
 
 import 'models/app_info.dart';
+import 'models/capture_method.dart';
 import 'models/card_details.dart';
 import 'models/errors.dart';
 import 'models/payment_intents.dart';
@@ -583,9 +584,7 @@ class MethodChannelStripe extends StripePlatform {
 
     _financialConnectionsEventHandler = params.onEvent;
 
-    return ResultParser<PaymentIntent>(
-      parseJson: (json) => PaymentIntent.fromJson(json),
-    ).parse(result: result!, successResultKey: 'paymentIntent');
+    return _parseIntentResult(result!, isPaymentIntent: isPaymentIntent);
   }
 
   @override
@@ -601,9 +600,73 @@ class MethodChannelStripe extends StripePlatform {
           'clientSecret': clientSecret,
         });
 
+    return _parseIntentResult(result!, isPaymentIntent: isPaymentIntent);
+  }
+
+  /// Parses a method channel result that may contain either a `paymentIntent`
+  /// or `setupIntent` key depending on [isPaymentIntent].
+  ///
+  /// When [isPaymentIntent] is false, the native SDK returns the result under
+  /// the `setupIntent` key. This helper converts the setup intent data into a
+  /// [PaymentIntent] to satisfy the platform interface contract.
+  PaymentIntent _parseIntentResult(
+    Map<String, dynamic> result, {
+    required bool isPaymentIntent,
+  }) {
+    if (isPaymentIntent) {
+      return ResultParser<PaymentIntent>(
+        parseJson: (json) => PaymentIntent.fromJson(json),
+      ).parse(result: result, successResultKey: 'paymentIntent');
+    }
+
+    final setupIntentJson = result['setupIntent'] as Map<String, dynamic>?;
+    if (setupIntentJson != null) {
+      return PaymentIntent(
+        id: setupIntentJson['id'] as String? ?? '',
+        amount: 0,
+        created: setupIntentJson['created']?.toString() ?? '',
+        currency: '',
+        status: _parseStatus(setupIntentJson['status'] as String? ?? ''),
+        clientSecret: setupIntentJson['clientSecret'] as String? ?? '',
+        livemode: setupIntentJson['livemode'] as bool? ?? false,
+        paymentMethodId: setupIntentJson['paymentMethodId'] as String?,
+        captureMethod: CaptureMethod.Automatic,
+        confirmationMethod: ConfirmationMethod.Automatic,
+      );
+    }
+
+    // Fallback: try paymentIntent key in case the native SDK format changes.
     return ResultParser<PaymentIntent>(
       parseJson: (json) => PaymentIntent.fromJson(json),
-    ).parse(result: result!, successResultKey: 'paymentIntent');
+    ).parse(result: result, successResultKey: 'paymentIntent');
+  }
+
+  static PaymentIntentsStatus _parseStatus(String value) {
+    switch (value) {
+      case 'Succeeded':
+      case 'succeeded':
+        return PaymentIntentsStatus.Succeeded;
+      case 'RequiresPaymentMethod':
+      case 'requires_payment_method':
+        return PaymentIntentsStatus.RequiresPaymentMethod;
+      case 'RequiresConfirmation':
+      case 'requires_confirmation':
+        return PaymentIntentsStatus.RequiresConfirmation;
+      case 'Canceled':
+      case 'canceled':
+        return PaymentIntentsStatus.Canceled;
+      case 'Processing':
+      case 'processing':
+        return PaymentIntentsStatus.Processing;
+      case 'RequiresAction':
+      case 'requires_action':
+        return PaymentIntentsStatus.RequiresAction;
+      case 'RequiresCapture':
+      case 'requires_capture':
+        return PaymentIntentsStatus.RequiresCapture;
+      default:
+        return PaymentIntentsStatus.Unknown;
+    }
   }
 
   @override