Verizon makes using gift cards on their website unnecessarily painful
Gotta love the annoyingly small barriers Verizon adds to make it difficult to use a gift card on their site. You've got the simple stuff like being unable to set up auto-pay with your gift card and then the annoying little quirks like not being able to copy paste the number and if you flip tabs while entering the number, it clears what you've typed.
Obviously I get the business sense of not wanting users to actually use the gift card, but seriously.......you've got to think a better UX would make increase customer lifetime value more than the value of a few gift cards.