Yes I know but this introduces an account effectively where are searches are linked by payment. Exactly what this is not supposed to be. Unless you top up and get a refund after every search then round trips

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no, we have x-cashu mode where it's not linked by payments at all. The response contains the refund cashu token. plus, since you're issuing tokens for a fixed price that the user paid for beforehand, users sending a fixed 42 sat cashu token per request eliminates the linking payments issue.