Verification required

so i have a debit card right because i’m a minor and can’t have a credit card yet and i don’t work since in most places i legally can’t (i’m 15) so my mom usually puts money in every once in a while for spotify and paying for my extra storage but a little bit ago i tried to buy a twitch sub to gift to my friend and it wouldn’t let me even though i knew i had enough money in my account to do so but fast forward i’m trying to download an app and it wont let me saying i need to verify my payment or something along those lines and so i go into the payment where i can see all the cards i have to pay for things and mine says something like verification required and so i try to delete it so i can put the same card back on because i know it has enough money in it but it wont let be because there’s a payment on that card at this time for my extra storage yet i can’t do anything like keep paying for extra storage when i get a pop up in my camera roll saying i don’t have enough room so uh what do i do?

[Re-Titled by Moderator]