I spent roughly four hours troubleshooting a failed Apple Developer Program enrollment payment.
The payment would not go through, and the enrollment flow gave no useful indication that the problem was the formatting of the billing information.
The eventual fix in my case was simple:
Enter the billing / payment information in ALL CAPITAL LETTERS.
Once the information was entered in ALL CAPS, the payment processed successfully.
For anyone searching for the same problem:
- Apple Developer Program payment failed
- Apple Developer enrollment payment declined
- Developer Program purchase failed
- Payment could not be completed
- Billing information rejected
- Apple Developer Program enrollment error
- Credit card payment failed
- Billing address mismatch
- ALL CAPS billing information
- Uppercase billing address
- Apple Developer payment verification
I tried troubleshooting the card, account, enrollment process, and verification flow, but the actual issue was apparently the capitalization of the entered billing information.
If Apple requires billing information to match a specific uppercase format, that requirement should be stated clearly in the enrollment form or error message.
I’m posting this mainly so the solution is searchable for the next person who gets stuck on the same undocumented formatting issue.
Important: This was the fix in my case. I’m not claiming Apple universally requires ALL CAPS for every enrollment payment, only that changing the billing information to ALL CAPS resolved my payment failure immediately.