Does not work apple pay

It is possible that it is not allowing an American card to be added to a Mexico device.

Go to these links - If you can't add cards to Wallet for Apple Pay - Apple Support

Apple Pay - Official Apple Support

Where are you located?

Are you able to add your bank card to Wallet? Have you made sure your region is correct?

Are you using a passcode/Face ID? Where did you buy the phone?