Deserializing payment methods from the Stripe API

[adouglass]

I'm making a call to my REST API to fetch a user's list of saved payment methods-- which returns the JSON provided via the Stripe API for a List.

  Future<List<PaymentMethod>> fetchPaymentMethods() async {
      final response = await http.get(
        uriPaymentMethods(),
        headers: {
          "Accept": "application/json",
          "content-type": "application/json",
          if (_sessionToken != null)
            HttpHeaders.authorizationHeader: 'Bearer $_sessionToken',
        },
      );
      final responseJson = HttpUtil.returnResponse(response) as List;
      return responseJson
          .map((json) => PaymentMethod.fromJson(json))
          .toList();
  }

The .fromJson method attempts to deserialize the payment method and errors on the Card property. It seems as though the generated .fromJson method is expecting Card with a capital C -- but the Stripe API returns all properties in lowercase.

flutter: NoSuchMethodError: The method '[]' was called on null.
Receiver: null
Tried calling:
flutter: #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1 $$_CardFromJson
package:stripe_platform_interface/…/models/payment_methods.g.dart:97
#2 new _$_Card.fromJson
package:stripe_platform_interface/…/models/payment_methods.freezed.dart:1513
#3 _$CardFromJson
package:stripe_platform_interface/…/models/payment_methods.freezed.dart:1323
#4 new Card.fromJson
package:stripe_platform_interface/…/models/payment_methods.dart:156
#5 $$_PaymentMethodFromJson
package:stripe_platform_interface/…/models/payment_methods.g.dart:16
#6 new _$_PaymentMethod.fromJson
package:stripe_platform_interface/…/models/payment_methods.freezed.dart:439
#7 _$PaymentMethodFromJson
package:stripe_platform_interface/…/models/payment_methods.freezed.dart:16
#8 new PaymentMethod.fromJson
package:stripe_platform_interface/…/models/payment_methods.dart:66

[remonh87]

The deserialization parameters have to do with sending objects through the method channels (for communicating with the repspective Stripe sdk) and has nothing to do with the Stripe API. I would suggest to convert the names to uppercase before casting it to this object in your app.

[cosmoarunn]

I tried hard casting to typos but after the following

      pmMethod['billingDetails'] = pmMethod['billing_details'];
      pmMethod['Card'] = pmMethod['card'];

i still get an error on SepaDebit which is not in my payment method list.
new _$_SepaDebit.fromJson (package:stripe_platform_interface/src/models/payment_methods.freezed.dart:1949:7)

I'am using 3.1.0 and I also tried 2.5.0.

Here's the code block

try {
      final results = await jsonDecode(response.body);
      final _paymentMethods = results['payment_methods'];

      List<PaymentMethod> _paymentMethodsList = _paymentMethods.map((pmMethod) {
        
        if (pmMethod['billing_details'] != null) {
          //pmMethod['billingDetails'] = pmMethod['billing_details'];
          //pmMethod['Card'] = pmMethod['card'];
        }
        return PaymentMethod.fromJson(pmMethod);
      }).toList();

    } on FormatException catch (_, fe) {
      print("**** Format Exception caught ****");
      //print(_.message);
      //print(fe.toString());
      return [];
    }