Stripe.com payment integration module

[split63]

Return url is not json encoded.
So script cannot read the PHP return URL

I put the changes on my mirrored test site, which operates in Stripe test mode.
Tried an Amazon Payment
Pressed the "Confirm Order" button and to the left of it appeared this message:

You must provide a `return_url` when confirming a PaymentIntent with the payment method type amazon_pay.

The transaction appeared on Stripe as "Incomplete"
On Zen, the message disappeared and I remained on the 3rd checkout page as if the "confirm order" button was never pressed