Access to raw time sheets and ways you will account for time when you're getting paid per hour is something to deal with in your contract. It is not acceptable for a client to decide that they need more or different documentation after the work has been completed or the bill presented.
If you didn't actually log your time as you were working . . .or didn't log it in a useful and legible way. . .then responding with confidence to this kind of query can be a little tricky. (Creating time logs after the invoice has been presented is fraud, too.) If this is the case, expect that you may have some price negotiation in your near future. I imagine this client wouldn't accept a notarized statement...;^)
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