Ihave 25$ on an itunes card and i need to buy spotify premium, i have no other payment method.

the best answer i can give you is to ask a friend to trade you 25$ for the card and take that on a prepaid card, or where ever you   got it from return it for 25$ and like i said a prepaid card or put it on your bank card if you have one. with currency there is not much to do but if its digital it can always be converted.   hope this .

you can redeem gift cards to add credit to your apple id balance, and then use that credit to make purchases in the app store, itunes store, or apple books, subscribe to apple music, or upgrade your icloud storage

a few, because i should have plenty.

the only way i would see could be an autoclicker type software. but that is very time consuming.