Use &vid=2

Example this link which you can get by right clicking on the program select button.

https://totaltennis.intennis.com.au/secure/customer/registration/v1/public/set-program?pid=14

changes to https://totaltennis.intennis.com.au/secure/customer/registration/v1/public/set-program?pid=14&vid=2

However, this is only support from version 14.9.5-b31 onwards