Separate shipping and billing addresses. My fiancee ordered a pack for $5, put in her credit card number, and put the address of the person she was buying it for in the shipping address slot. Then she realized there had been no place to put the billing address.

Long story short, the credit card charge went through, the package did not get shipped, and she's in the middle of resolving the situation via email with somebody at CaH, hoping her giftee gets their gift.