Re: [w3c/browser-payment-api] Should it be possible to vary amounts depending on payment method (#4)

In TAG review @triblondon said:

> #23 and #4 discuss the ability for merchants to express a payment method preference and to charge differently for different payment methods. Merchant preference seems basically meaningless unless there is a charge element - the user has no reason to choose a particular payment method simply because the merchant wants them to, but they would certainly be swayed if using one method added a surcharge. Perhaps the simplest way to model that would be to have the merchant pre-calculate a supplement charge to attach to the payment method at the PaymentRequest level, rather than polluting the PaymentDetails items dictionary with multiple additional charges per item (this is suggested in w3c/browser-payment-api#4 (comment), which I agree with). I'm concerned that any potential desire to add granularity to the cost of an individual item will get multi-dimensional very quickly - eg supporting different charges based on payment method, and also expressing pricing in different currencie
 s, you w
 ould need a value for each intersection of that possibility space.

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