Adding a payment method

Mohsuleh Said,

"Adding a payment method: I have successfully added a payment method but when I attempted a purchase it was declined"

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Security & Privacy Concern:

Also, contact your finial institution(i.e. bank) that assign the method(s) of payment you are using. Perhaps, this is not going through because it is seen as a scam, on the bank's part?

I think you need to call Support for assistance. It may be an account problem. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call       

Eric Root probably will have more ideas, but you may want to get Apple telephone support  for help in solving your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 Be patient sometimes Apple support is closed to immediate phone support.

See Change, add, or remove Apple ID payment methods https://support.apple.com/en-us/HT201266

See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005

What happens when you try? Error message(s)? More information would help.

Probably you should try the support options we mentioned.