NIP 29 is deceptively hard. Trying to implement zaps on access-controlled groups right now, and I either have to have the zapper send them to publicly writable relays, or white-list zap responses on the group relay somehow, since the zapper doesn't have permission to write to the group.
So how do you want to proceed?
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Not sure yet
Just figured it out, just check the zap request (which is embedded in the zap receipt) for authorization.
Nice 👍