Re: [webpayments] Abstract payment architecture (#11)

> Can we make it explicit in the architecture if there may be multiple Payment Mediators involved in particular payment interaction

What I'm proposing is a single mediator otherwise you need a mediator to pick the mediator. It's entirely possible that some implementations will make this a "pluggable" component or even allow this to be hosted remotely but I'd still expect there to only ever be one active mediator for a payment.

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https://github.com/w3c/webpayments/issues/11#issuecomment-158144847