Yes, paying on your credit card with a prepaid gift card is no different than using the debit card that's attached to your checking account. The gift card has to be a Visa, MasterCard, American Express or Discover gift card, though, not a store branded card like Starbucks, etc.
If it's a visa or MasterCard gift card you can.
I'd call the number on the back of your card.
Yes , they accept those as payments
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