Re: [w3c/payment-request] remove matching .data text from .show() (#578)

> "Determine which payment handlers support identifier (for example, by looking at payment method capabilities)."

No. Because: At this point in the `.show()` algorithm you can only look at the PMI. Then later, when the payment sheet is actually shown, and the method is selected by the end-user, the rules for the payment method put restrictions on the payment handler's UI. 

Hopefully this screenshot from Chrome clarifies things:

![screenshot_2017-08-08_14_32_32](https://user-images.githubusercontent.com/870154/29056623-a55ebfd0-7c47-11e7-9756-e5c99ea0cfa1.png)

So: 

1. PMI is "basic-card" - so the browser's Payment Handler for "basic-card" is shown.
2. Only "debit cards". 
3. Only "mastercard".

Thus, it's impossible for the user to "Pay" without meeting the condition - they can only abort.  

We can amend the end of `.show()` to talk about this. I'm currently fixing the Basic Card spec to describe these things better.   

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/payment-request/pull/578#issuecomment-320848507