The client secret associated with the PaymentIntent.
Optional
returnURL: stringAn optional return URL so the Stripe SDK can redirect back to your app after authentication. This should match the return_url
you specified during PaymentIntent confirmation.
Handles any nextAction required to authenticate the PaymentIntent. Call this method if you are using manual confirmation. See https://stripe.com/docs/payments/accept-a-payment?platform=react-native&ui=custom