I wish I knew what to suggest. I think people could probably still buy things for you as a gift but I don't know what you'd have to do to go through the verifications. (Basically, I don't know if that's required in cases of gift purchases, which would be different than GC purchases.) I do know that if I pay for something with store credit (from sales in that month), I don't have to enter CC info if the whole order is covered by it. I just don't know if the same would apply or not.

-D
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It's all fun and games until someone loses an eye texture.