How do I allow a shopping cart in my institution's Canvas Catalog?
As a Catalog admin, you can enable or disable a shopping cart from the root catalog in the Settings menu.
Open Admin

In the User Menu, click the Admin link.
Open Catalogs

Click the Catalogs link.
Enable Shopping Cart

Click the Catalog Info tab [1].
By default, Enable shopping cart for this Catalog and its sub-catalogs is turned on. To disable the shopping cart, click the Enable shopping cart for this Catalog and its sub-catalogs toggle to off [2].
Save Catalog Info

Click the Save button.