Cannot add payment method problems with mu credit card adding

Contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call     

Billings and Subscriptions 

If necessary, try Twitter

https://twitter.com/AppleSupport.          People have posted it may take an hour or more to get a response.

Why my Iphone11 will not take my credit card information. Now my phone payment area is disabled my iTunes and

Contact iTunes Support using the links I posted above.

i can’t use my Amex card on my Apple store

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