Subway donation for warmane?

Hi im from USA and would like to donate just enough to get the queue bypass and be able to sell characters. I have a visa prepaid giftcard and im looking into buying a subway card to donate.

im using this website to buy the card https://subway.cashstar.com/gift-card/buy/ but then i see this message on the warmane website "We only accept SUBWAY® cards purchased in a SUBWAY® restaurant (online or 3rd party cards not accepted)."

does it mean that i have to physically walk into a subway buy a card and then use the pin? I cant just buy from this website and then use the pin?

im looking to donate 12.50$ to just get enough to get 10 coins.

how far away do you live from subway? There may not even be a difference between the cards.

Just go to Subway and get a gift card. I did it today too. Simplest way of donating ever.