It doesn't accept my credit card information
I can't purchase more icloud storage.
I can't purchase more icloud storage.
If your payment info is correct and accepted, then you can buy extra storage.
If your payment info is correct and accepted, then you can buy extra storage.
In that case you should be able to subscribe to more iCloud Storage.
Read here: Buy more iCloud storage - Apple Support
You need a valid credit card with your name on it, issued by your bank.
I have it. It is asking for the security code but there is no area for me to enter it.
Try here: https://appleid.apple.com
no section there to purchase iCloud storage
I am able to purchase apps with the same info. It is correct.
It doesn't accept my credit card information