Why can’t I purchase credit on my Dingtone using my Apple purchase method

Hello phillips51,

You can pay using Apple Pay in stores, within apps and on the web, and more. In addition to accepting Apple Pay, the merchant must accept your payment card and payment network. If you’re not able to use Apple Pay with a particular merchant, we recommend reaching out to them to check of alternate payment options. Make purchases using Apple Pay - Apple Support

Cheers!