"valid form" refers to a correct or acceptable structure or arrangement of something. It means that the arrangement or structure follows the rules or requirements set for it. Full definition
When applying for a car title loan, customers must present valid forms of identification, income, residency, and vehicle title to their car title loan officer. (800loanmart.com)
Must present valid form of military ID or MVP M life Rewards card to receive discounts. (mgmresorts.com)
What if your only valid form of ID was your driver's license, which was conveniently tucked into your wallet — the same wallet that was stolen? (travelinsurancereview.net)