To connect your property to Booking.com, please ensure that you have already created a Rate Plan for the Booking.com sales channel in Delta PMS.
How to Add Delta PMS as a User in Booking.com Extranet
Sign in to your Booking.com Extranet (Booking.com for Partners).
Click the user account icon in the top-right corner.
Select Create and manage users.
Click Manage primary accounts.
Select Add a user, then click New user.
Enter the name and email address of the Delta PMS operation account, [email protected].
Click Send invite to send the invitation email.
After adding Delta PMS as a User in Booking.com Extranet, please contact [email protected].