Unable to add any card for payment in apple pay

If you get the Learn More dialog box that takes you to the support

document you posted from, make sure your iPhone is set to a country

where Apple Pay is supported in Settings ➜ General ➜ Language &

Region ➜ Region. click here ➡️ Countries and regions that support Apple Pay - Apple Support

When you try to add a credit/debit card what error message do you receive?

The card message comes not added