Verification Required

I’m trybig to make in app purchases but almost every time I hit a purchase button a message pops up saying “verification required”. It has me enter the cvc code on the back of my card and then I go back to the game to get an error message and I have to hit the purchase button again to buy what I wanted. This wasn’t a big deal until I found out it’s been causing me to get double charged and it’s not the games fault it’s this verification process. How do I get this message to stop popping up? I shouldn’t have to verify my payment option every time I use it but I can’t find a way to turn it off. Help?