Hi Kristen,
If you have already purchased the product and need a license you can purchase a gift certificate[s] in the amount of the required license and indicate in the order comments which products you are purchasing a license for.
As for credit I think what you're doing is fine!
Please let us know if you have any additional questions!
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Katie - owner of DesignerDigitals
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My Blog : Documenting + Designing
Camera: Nikon D700 with Speedlight SB-600
Lenses: 16-35mm F4, 24-70mm F2.8, 70-200mm F2.8
Software: Adobe PSE3 and CS3, Illustrator CS3
computer platform: Mac