You create a quick button for season passes in the same way as regular quick buttons

Products> Settings > Quick Buttons

Step one is to choose which group the season pass should be under. If you don't have a group or want to create a new one, click on “New group”.

If you already have a group you want to use, select that group by clicking on the selected group.

All the buttons under this group will then be displayed.

Then you will create a new button.

Search for the season pass you want to create a quick button for.
Season passes are marked with (SEASONPASS)

The name is automatically generated from the name of the season pass, but can be changed to a desired name.

If necessary, choose a color before saving.

After you have finished creating quick buttons, you must log out and log in to the checkout to get the new updates.