Hertz and Avis also at Irving Airport but must be normal office hours for that location.
I am at the Airport and I cannot rent because I have a debit card.
At Dallas there are at least 10 different suppliers, to view on what cards are accepted look here:-
At STEP2 of our 3 step online booking process, to the right of the car photo of your choice, is a link entitled "IMPORTANT INFORMATION". Click on this link and it will open an additional smaller window, where the terms and conditions appertaining to that particular car at your chosen location are displayed.