Huh OK, I thought that would be controversial, but if we're all OK with one per user agent then I'm happy to work on speccing that.
I don't feel strongly on the error type. It's a bit weird to say it's an invalid state since the developer can't know ahead of time whether they're going to be screwed over by some other site doing a payment request at the same time, so it's not like they did anything invalid.
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