PAYMENT METHOD ISSUE
how can I input my payment methods without getting it invalid and what could be the solution
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See If your payment method is declined in the App Store or iTunes Store https://support.apple.com/en-us/HT203005
You 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 Apple support is closed to immediate phone support.
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.