I cant add my payment method

What happens when you try? Error message(s)? Payment method declined?

See the Apple Support article(s) below.

Apple ID payment information - If your payment method is declined, or you have a billing issue with a previous purchase in the iTunes Store.    

If necessary, contact iTunes Support. See the Apple Support articles below for contact information.   

iTunes Support – world wide 

Apple Support schedule phone call       

If necessary, try Twitter

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

Log into your account in the App Store/iTunes and you should be able to change/verify it there. Or you can click the blue Edit payment methods in the article below. When signed in and the page loads, you will be on the credit card page. After updating that, click the Go Back button at the lower left and you will be on the address page.

Apple ID payment information - change.  

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

Also see my search results on payment method is declined in iTunes or the App Store error

And see How to fix when your payment method is declined in iTunes or the App Store

https://appletoolbox.com/itunes-store-your-credit-card-was-declined-please-enter-valid-credit-card-information/#How_do_I_fix_the_error_ldquoThis_payment_cannot_be_processed_at_this_time_please_try_again_laterrdquo

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But, note that you may be having a server problem. See If you can't connect to the App Store, iTunes Store, or other Apple services  https://support.apple.com/en-us/HT201400. There have been quite a few server connection problems lately. In this regard, you can Check Apple’s System Status page to make sure the needed server is ready to go.

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In either case, you may want to contact Apple support:

You also can 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 you can't get immediate telephone support.

You also can use Apple Support Twitter https://twitter.com/AppleSupport

And here is how to contact iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes After choosing your country, see the heading Tell us how we can help.