Payment Method Not Accepted
I tried adding a payment method in Settings so that I can make purchase on App Store and it said that it could not verify the card and asked to contact Apple Support. The card details are definitely correct though.
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Since it says to contact iTunes Support, try this:
1. Click on this link --> https://support.apple.com/choose-country-region/media-services
2. Select your country
3. Select: Billing & Subscriptions
4. Select: Subscriptions & Purchases
5. Select: Update payment method
6. Select a chat session or a phone call.