I’m having problems with my Apple Pay, can you help me?
I’m trying to buy with Apple Pay but every time that I tried it said my card was declined but I have limit and my card is active.
iPhone 6s Plus, iOS 15
Perhaps a long shot:
Do you use VPN? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile.
Contact your card issuer, and ask if the declined the transaction. If they say they have no record of it, then your phone is not communicating with the issuer. Which is why I suggested VPN first.