I think there us a still a use case for an a publisher of a handler to get the user consent out of the way before the payment flow.
i.e. I login to my bank's online banking and they prompt me to install their payment handler so that I can use it to pay "more securely" when shopping online. I click the "install" button and the SW is registered.
As the bank I'd want to user to give consent to the handler handling payment requests during that flow.
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