My apple wallet doesn’t let me add any card to it

Hi tatev257,

welcome to the Apple (user-to-user) Community.

Re: "My apple wallet doesn’t let me add any card to it"

Check if Apple Pay is available in your country or region:

and, if so, the Apple Pay participating banks

Countries and regions that support Apple Pay - Apple Support

If necessary : Check with your card-provider(s) that they support Apple Pay.

Apple support's article gives the steps to follow to add a card to Wallet:

How to: Set up Apple Pay - Apple Support 

Eg: Says

"Make sure that you sign in to iCloud on all your devices.

On your iOS device, you need to set up Face ID, Touch ID or a passcode".

Check you have a compatible device:

Devices compatible with Apple Pay - Apple Support

Check if you are signed in (to your device) with your Apple ID:

Sign in with your Apple ID - Apple Support

If needed:

Apple Pay Support:

Get support with Apple Pay:

Apple Pay - Official Apple Support

All the best :-)