If you've found yourself unable to add your Visa debit or credit card to Apple Pay this morning, you're not alone. The payment service is currently experiencing some sort of disruption at the moment, and Apple is working to fix it.
Apple posted the following message to its system status page:
Some users unable to add Visa debit and credit cards to Apple Pay.
The outage has been ongoing since a little after 4:00 a.m. this morning. It does not appear to be affecting cards from other providers at the moment, so Apple Pay should behave normally for most other users.
We'll be sure to let you know when the disruption has been resolved.
Source: Apple