Architecture thoughts

Hi all,

Following TPAC and after looking at the two proposals on the table for the
WG I have tried to document what I consider a very high level set of
minimal components for a Web Payments architecture (considering only the
elements that are in scope for the WG, i.e. payment initiation - everything
between the payer and payee or their PSPs).

I have put this on the wiki for everyone to have a look at but will
continue working on it over the next day or two with a view to presenting
it on Thursday's call.

The motivation is to establish a common set of components for which there
is consensus on their minimum set of functions and their names. I have
avoided using phrases like "payment instrument" and "payment scheme" so
that our discussion going forward is not influenced by the variety of
definitions these phrases have from different stakeholders.

https://github.com/w3c/webpayments/wiki/A-Payments-Initiation-Architecture-for-the-Web

Look forward to hearing your thoughts,
Adrian