Can not add money to my apple wallet

I can not add money to my apple wallet

Correct you can't add money to Walet.

Tap Wallet -> then tap the ✚ sign (top right of the screen).

You'll have the option to add a Credit Card, Debit Card, Apple Card, or transit card in certain cities, so that depends on your country.

For example: add Debit Card or Public transport card.

Debit Card -> Choose a bank, tap on your Bank and add.

Public transport card ->  only some countries can be added, tap on it and see if your country is listed.