You should compare the information QSL.com requires with that already exposed in the FCC database, which will be publicly accessible. Your callsign, name, address (could be a PO Box - in the old days the physical location of your permanent station was required but now a mailing address is sufficient), FRN, license history and links to non-amateur licenses are all viewable. I don't use QSL.com, but I wonder what beyond that they would ask for?
-Chris