HELP NEEDED: Missing return_url parameter for IDEAL payments

[ayushin]

This is not a duplicate of #225

While you can set urlScheme this does not work with universal links - we really do need to be able to pass return_url to IDEAL payment confirmation in order to be able to handle payments across platforms.

Stripe example:

    } = await stripe.confirmIdealPayment(clientSecret, {
      payment_method: {
        ideal: elements.getElement(IdealBankElement),
        billing_details: {
          name: 'Jenny Rosen',
        },
      },
      return_url: `${window.location.origin}/ideal?return=true`,

[ayushin]

Also window.location.href should not be used as return_url blindly in stripe_web.dart if return_url is specified

[ayushin]

I could use some help to implement this workaround on Android:

#610

[remonh87]

fixed as part of 2.4.0.

[davidmigloz]

I see that you can specify a returnUrl if you are using the payment sheet:

flutter_stripe/packages/stripe_platform_interface/lib/src/models/payment_sheet.freezed.dart

Line 85 in 4d47412

String? get returnURL => throw _privateConstructorUsedError;

But if you are using the sdk's webview you don't have any option to specify a returnUrl.
So, in iOS we are forced to use custom URL scheme instead of being able to use universal links.

flutter_stripe/packages/stripe_ios/ios/Classes/Stripe Sdk/Mappers.swift

Lines 746 to 748 in 4d47412

	class func mapToReturnURL(urlScheme: String) -> String {
	return urlScheme + "://safepay"
	}

Also for web, returnUrl is still hardcoded to window.location.href:

flutter_stripe/packages/stripe_web/lib/src/web_stripe.dart

Line 153 in 4d47412

return_url: window.location.href,

Would it be possible to expose returnUrl in confirmPayment() method so that we can use universal links in iOS and have more flexibility in web?