Issue with adding payment method

There may be an account problem. Contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  You may need to pick a problem that is slightly different than yours to get a chat option.  

iTunes Support

iTunes Support – world wide

Whether or not your card is accepted has nothing to do with me, you know that these are user forums and that we are just fellow users.

There is, or was, a problem with Nigerian banks : How do i make app purchase using my credi… - Apple Community

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

It might be being declined because it's a debit card, not all work with iTunes. Try a different card, preferably a credit card.

For a card to have a chance of being accepted it needs to be registered to the same name and address (including format and spacing etc) that you have on your iTunes account, and have been issued by a bank in the country where you are (and therefore the country which is on your iTunes account). 

I need to add my card details to upgrade my icloud storage but it keeps on declining my payment method. What the fuck? I use the same card for other foreign transactions without any problems. I do not know why apple will always be different. I am from Nigeria. I hope you guys do not discriminate. I can not get an amex card. It is not issued here. This is so frustrating.

I have tried 3 debit master cards, 4rom 3 diff banks, & they are all declined, i’m frustrated pls I need ur help.

I have tried 3 debit master cards, 4rom 3 diff banks, & they are all declined, i’m frustrated pls I need ur help.