Unable to purchase apps on App Store
Please I’m unable to purchase on AppStore I have being getting this message couple of days now: iTunes Store unable to process purchase at this this time try again later
Follow the directions here below to contact iTunes Support so they may help you resolve this issue.
To contact iTunes Support, do this:
1. Click on this link --> Choose your country or region - Official Apple Support
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.
Copied from iTunes support - Apple Community