@ianbjacobs
Thanks for the reply :)
One possible use case would be for online casinos. A player wants to deposit some money to play with, so they press a "Deposit money" button. A PaymentRequest is made, and the player gets to choose not just what to pay with, but also how much (within limits!) they want to deposit. It could make for a better experience for the player than having to enter the amount in a separate web form.
I imagine there are other types of services with digital wallets (such as video-game-cenetered stores where people can buy lots of cheap cosmetic items and don't want to have to make a new payment every time they decide to buy something small) that could find a use for it.
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