Fix PayPal payments

[JonasWanke]

Fixes: #1211

The serialization of MandateDataCustomerAcceptance was incorrect: In Stripe's API, it corresponds to a sealed union representing an online or an offline mandate. In Stripe's Android SDK, it's modelled the same way, though only online is supported. To maintain backwards compatibility, I kept the existing class structure and only added custom fromJson(…) and toJson(…) implementations, though a cleaner design would probably be a named constructor MandateDataCustomerAcceptance.online(…).

The other problem was that PaymentMethodType was missing a PayPal variant, meaning the native SDK's result message couldn't be parsed.

Now, payment and setup intents for subscriptions in Stripe are working for us both on Android and iOS with the following parameters:

const params = PaymentMethodParams.payPal(
  paymentMethodData: PaymentMethodData(
    mandateData: MandateData(
      customerAcceptance: MandateDataCustomerAcceptance(
        ipAddress: MandateDataOnlineData(
          ipAddress: '127.0.0.1',
          userAgent: 'device',
        ),
      ),
    ),
  ),
);

[remonh87]

@JonasWanke thanks for the pr. Can you run dart format in your pr so we do not see the formatting changes in your pr?

[JonasWanke]

Hi @remonh87, I just ran dart format ., but it only changed another file. The first commit I pushed (495a7fa) was the result of running build_runner, which already changed the files. I'm guessing that either some formatting behavior changed or they were otherwise formatted differently before, since both the build_runner and dart format agree on the current formatting

[remonh87]

thanks

[bonnyfone]

thanks for the fix! any timeline for when it will be published on pub.dev?

[artemsorochan]

Any timeline on publishing a new version with this MR would be appreciated. Thanks in advance!

[artemsorochan]

Any update on this?