After you become a member of the Expert program and start booking apartments with a 10% discount from Expert owners, the inscription .expert account will appear in your personal account and the profile will be displayed not on a blue, but on a beige background:
In My booking menu in booking card (which you made with Expert program), you will see the prices with all discounts. However, there is no mentioning that the booking was made with Expert program. You'll see the logo -5%, which means that the order has been made with a discount from the loyalty program.
Read more about Expert program.
Read more about How you can become a member of Expert program.