Re: [webpayments] Should the Web Payments API cater for the invoicing part of the full web purchase flow ? (#60)

@adrianhopebailie,

I think we should establish:
 * Is there a minimal merchant use case that we must address to get adoption of the API?
 * If so, what's the minimal information required to achieve it?

For example, if merchants say to us something like "We can't use the API unless there's a way to associate an offer with a receipt" then we should listen carefully to that. While it is not in our scope to create standards for digital receipts, the merchant may need information to link two "events"; I think this is what you are saying and it sounds reasonable, but we need to ground it in merchant needs IMO.

Ian

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