[w3c/payment-request] Alternative Options for 'Pay' button provided in the Browser UI (#701)

I was looking the [Google intro](https://developers.google.com/web/fundamentals/payments/) and I see the final button description is always `Pay` in the Chrome context. I am unable to find any mention in the spec that this can be changed.

For cases where the payment is either not processed right away, or the payment info if provided for future charges. I think there should be a way to change this 'Pay' button to alternative wording. 'Pay' being a strong indication that the transaction is deemed immediate, which could be misleading to users.

A couple of options like 'Add' or 'Send' would be useful in this context.

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