Those are definitely wallets not users. The receipt event is sent from the pubkey of the LN wallet. What I’m talking about are the tags in the receipt event. In the NIP Appendix E it has this bullet point:

> - tags MUST include the p tag AND optional e tag from the zap request

I think the tags contain the pubkey of the person who requested the invoice. The p tag in the event is the pubkey you’re looking for.

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I just ran the experiment. The pubkey in the receipt is the recipient of the zap, not the sender. I'm looking for the pubkey of the sender.