Why can't we add a credit / debit card to Apple Pay (Wallet)

Appel Pay is a service launched by Apple, through which we can add debit cards or credit cards in a virtual wallet, through the application: Wallet.
After the cards are added to the Apple Pay account, we have the opportunity to make online payments or payments in the stores that accept this Apple service. Of course, within the limit of the balance available in the bank account attached to the card.

Once will be released iOS 11.2 In the final version, through the application Messages will be able to send and receive money directly from iPhone or iPad. The condition is that the person we want to send or ask for money, have iOS 11.2 and a card / bank account posted in Apple Pay. This service will be called Apple Pay Cash And at the moment it is in the state of "preview" of the version iOS 11.2 Beta 2.

A to detail and explain you have to do so you can send and receive money via iMessages, in a future tutorial.

A problem which is hitting many is that I cannot add credit card or debit card to Apple Pay / Wallet at the initialization of iOS on iPhone or iPad.
"Your Issuer Does Not Yet Offer Support for This Card“.

Most of the time, this problem does not belong to a limitation of the account from the bank or from a lack of funds on the account. Although Apple urges all users to use Apple Pay, access to this service is available for a limited number of countries and banks in these countries. In Europe, Apple Pay can only be used if you are the client of banks who have partnership with Apple, from: Denmark, Guernsey, Finland, Germany, Italy, Spain, Russia, Island Jersey, San Marino, Ireland, Sweden, Switzerland, Vatican and UK (UK).
Romania, Hungary, Bulgaria, the countries of the old Yugoslavs and many more in Europe, have to wait until Apple Pay can be used by iPhone and iPad owners. Complete and updated list of banks in Europe participating in Apple Pay, you can find it on the page Apple officala.
Be careful, however, that there are also banks that accept Apple Pay, the service is only available for certain types of Mastercard cards, Visa or Restaurant Visa.

If you have an account of one of the banks that accept Apple Pay, DR cannot add your card to the iPhone or iPad, the first step would be to contact the bank. There are banks that as a security measure limits access to certain services until the client's request.