Apple store

Hello ~ Take a look here:

If your payment method is declined in the App Store or iTunes Store - Apple Support

Go ahead and contact Apple from the blue link or go to upper right hand corner and click on Get Support and they will be happy to help you.

~Katana-San~

Hello ~ Are you trying to add a payment method? What exactly is happening when you try to download something? In the meantime take a look here:

Change, add, or remove Apple ID payment methods

~Katana-San~