Providers urlScheme ignored when using paymentMethodId in confirmPayment (iOS)

[ghitier]

Describe the bug
When calling confirmPayment (of the useStripe hook) with the paymentMethodId option. The urlScheme of the StripeProvider is ignored. This issue is iOS only.

To Reproduce
Steps to reproduce the behavior:

Call confirmPayment with an existing paymentMethodId, and have your app scheme in the provider:

const MyPaymentComponent = () => {
  const { confirmPayment } = useStripe();

  const pay = async () => {
    const { paymentIntent, error } = await confirmPayment(
      stripe_client_secret,
      //
      // Note: the paymentMethod used needs to trigger a 3DS WebView flow.
      { type: 'Card', paymentMethodId: 'pm_somepmid' },
    );
  }

  return <Button onPress={pay} title="pay" />
}

const MyParentComponent = () => (
  <StripeProvider publishableKey="mypublishablekey" urlScheme="my-app">
    <MyPaymentComponent />
  </StripeProvider>
);

Expected behavior
The "return_url" should visible in the POST /v1/payment_intents/..../confirm request on the stripe dashboard, consequently once the 3DS WebView challenge was completed, it should be closed and return to the app.

Screenshots
If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: iPhone 12 (simulator)
• OS: iOS
• Version: 14.5

Additional context
I have applied this patch to fix the issue, for stripe-react-native version 0.1.4:

diff --git a/node_modules/@stripe/stripe-react-native/ios/StripeSdk.swift b/node_modules/@stripe/stripe-react-native/ios/StripeSdk.swift
index 379e1f1..4e9deba 100644
--- a/node_modules/@stripe/stripe-react-native/ios/StripeSdk.swift
+++ b/node_modules/@stripe/stripe-react-native/ios/StripeSdk.swift
@@ -603,10 +603,10 @@ class StripeSdk: RCTEventEmitter, STPApplePayContextDelegate, STPBankSelectionVi
             paymentIntentParams.paymentMethodParams = paymentMethodParams
             paymentIntentParams.paymentMethodOptions = paymentMethodOptions
             paymentIntentParams.shipping = Mappers.mapToShippingDetails(shippingDetails: params["shippingDetails"] as? NSDictionary)
+        }
         
-            if let urlScheme = urlScheme {
-                paymentIntentParams.returnURL = Mappers.mapToReturnURL(urlScheme: urlScheme)
-            }
+        if let urlScheme = urlScheme {
+            paymentIntentParams.returnURL = Mappers.mapToReturnURL(urlScheme: urlScheme)
         }
         
         let paymentHandler = STPPaymentHandler.shared()

[thorsten-stripe]

Thanks for flagging it, indeed missing it here https://github.com/stripe/stripe-react-native/blob/master/ios/StripeSdk.swift#L587

[4gmayank]

Try adding
Stripe.publishableKey,
Stripe.merchantIdentifier = "acct_1IL78e48329489014f";
Stripe.stripeAccountId = "acct_1IL78e48329489014f";
Stripe.urlScheme
before initializing Stripe instance.