Why is South Sudan not listed in the countries in the Apple Store, this has been denying my payment method that it is not valid in the store
My payment method is not valid in the Apple Store, I am in South Sudan
iPhone 12 Pro Max, iOS 18
Question marked as
Apple does not have any App Store services in South Sudan, nor Apple Pay.
As you will find in the linked support documents below South Sudan is not included in the countries where Apple provides these services.
See:
Availability of Apple Media Services - Apple Support
Countries and regions that support Apple Pay - Apple Support
If you are trying to use a payment card from South Sudan it will not be accepted in an App Store of another country.