Re: [w3c/payment-request] Make "total" and "details" optional (#912)

> If it's important to invoke the payment flow of the digital goods service via PR API then why not simply pass in the amount that was returned from itemService.getDetails?

That would give an impression to the web developer that the amount can be modified and is being passed to the payment handler. That is not the case, however, as these types of payment handlers use the product ID to lookup the price in their source of truth database.

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