Customer are able to pay for and use GC without problems most of time, however, every once in a while, a customer will pay for the GC, I see a invoice they paid for it, and it shows in paypal, but for some reason, it doesn't issue them an actual GC.

What can I do to resolve this?
Can I make a GC, or only Coupon Codes?

I would like to be able to make GC so when I need to refund customers, they have a GC to use instead of a Coupon Code.

Any help would be greatly appreciated. Thanks.