Via UI/Admin Console:
Within Chargebee's UI, if Product Families is visible under Product Catalog in the navigation panel, then your site is on Product Catalog (PC) 2.0:
Via API:
You can use the List Site Configurations API to determine the PC version of your site - https://apidocs.chargebee.com/docs/api/configurations#list_site_configurations
Response:
Attributes: