PayPal on iOS does not accept custom URL

[Mikkelet]

Im trying to integrate PayPal, and Im having problems with the returnUrl. Admittedly, I am not sure it's the fault of this library, but I cannot find other people with the same problem, and I think I followed Stripes documentation.

main.dart:

  Stripe.publishableKey = const String.fromEnvironment('STRIPE_PK_KEY');
  Stripe.merchantIdentifier =
      const String.fromEnvironment('STRIPE_MERCHANT_ID');
  Stripe.urlScheme = 'my-app';
  Stripe.setReturnUrlSchemeOnAndroid = true;
  await Stripe.instance.applySettings();

payment_screen.dart:

      await Stripe.instance.initPaymentSheet(
        paymentSheetParameters: SetupPaymentSheetParameters(
          returnURL: 'my-app://',
          allowsDelayedPaymentMethods: true,
           ... other params
        ),
      );

I've also added my-app as a CFBundleURLSchemes in the Info.plist. But really this is not an issue yet, because the app cannot even open paypal confirmation because of this error:

However if I pass in an https URL, I actually can continue, but the returnUrl just opens a website, and I cannot set associated domains right now

[remonh87]

yes you are correct you have to provide an https link for iOS. I think the: https://docs.flutter.dev/cookbook/navigation/set-up-universal-links can be very useful.

[Mikkelet]

Yes we did that but it didnt work. I even made local tests and it still didnt work.

our well-know, hosted at https://my-app.com/.well-known/apple-app-site-association

{
  "applinks": {
    "apps": [],
    "details": [
      {
        "appIDs": ["ABCD1234.com.app.myapp"],
        "paths": [
          "*"
        ],
        "components": [
          {
            "/": "/*"
          }
        ]
      }
    ]
  }
}

In the end, we actually found a solution: navigate to a url that then redirects to your app.

expressjs example:

import { Request, Response } from "express";

const app = express()

async function redirect(req: Request, res: Response): Promise<void> {
    res.redirect("my-app://")
}
app.get("/redirect", redirect)

then in your payment sheet:

      await Stripe.instance.initPaymentSheet(
        paymentSheetParameters: SetupPaymentSheetParameters(
          returnURL: 'https://my-app.com/redirect',
        ),
      );