Quoted from kaneda:If you made your payments on time, their would be no interest.
That is not how credit cards work. There are no credit cards that have 0% interest for 3 years if you make your payments on time.
If Zippy is paying interest and wants to put what he sells the pin for as a payment on his credit card, I would bet that there is still a balance on the card even if he has not used it since the initial purchase.
For the OP - GLWS- hope other pin purchases turn out better for you.