What does "Sale to verify" mean?
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The register could not confirm that a sale was recorded: it blocks payments until it restarts, and the customer must never pay again. After restarting the register, click Pay: the list Sales to verify before taking payment says whether the sale is Found (already paid, not to be taken again) or Missing (nothing was paid, it can be taken).
Full guide : Handling “Sale to verify” after a failure.