Stripe Express Checkout Element Integration

We've applied this as a patch and tested, it work great. We're deploying it to a production site tomorrow. Not sure if you want to call that "Reviewed and tested by the community or not".

Thanks!

niharika.s → changed the visibility of the branch 3477028-stripe-express-checkout to hidden.

Whao, super nice to see this, really looking forward to the express functionality, this will be huge! Thank you!

anybody → changed the visibility of the branch 3477028-stripe-express-checkout to active.

anybody → changed the visibility of the branch 8.x-1.x to hidden.

Any further plans here @vmarchuk I think this is a super important feature. It's assigned to you currently, so nobody else will work on it so far.

Does this patch currently reset things properly when someone exits the Express Checkout Element and goes through normal checkout to pay via the Payment Element? We're getting reports from production usage that someone exiting one path and going to the other causes data loss.