I haven't done a payjoin for a couple of years but I thought it required a cooperative receiver to add another input.
Is this correct or can you turn any any payment into a payjoin?
I guess you can do a payjoin with yourself, not sure why you would. Typical it’s seen as a tx with another party. Payjoinv1 needed synchronous parties to be online at the same time. Payjoinv2 is asynchronous.
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