Why can’t i add a card to my apple pay

Make sure you have gone through the steps Apple describes in If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support

See if there is a solution in If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support

Or contact Apple Support - choose Apple Pay

Sorry JeyKlaire,

The first link above should have been Set up Apple Pay, to see if you have tried but failed to get you card connected to Apple Pay on your iPhone.