Re: [w3c/browser-payment-api] Introduce transaction_id and server callback (#292)

I'm a bit worried that a 128bit UUID will be hard to leverage on statement descriptors of a large number (if not all) payment methods, which would jeopardize some of the value of such IDs: being a customer visible value that can be used for support.

I also think they should be generated by the merchants, as they are incentivized to have IDs that can be properly displayed to customers on the payment methods they support.



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