Fix confirmCardPayment in localstripe-v3.js and add an example #242
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I wanted to add an example of using localstripe-v3.js, as a way of testing #240 and also because it seems generally useful as documentation.
Along the way I discovered confirmCardPayment isn't quite right; it skips /confirm and goes right to /_authenticate. This fails on cards that don't require 3D Secure authentication because the /_authenticate endpoint is confused about why it's being called at all. I fixed this, modeled on how confirmCardSetup works.
This in turn required a small fix to the localstripe backend to allow calls to /confirm from the browser (i.e., with a client_secret and key as form data).