Hi @thrishtilabs ,
Categories currently available though our REST APIs, which you can use with API Keys, here’s more info:
API Keys - https://dev.wix.com/api/rest/getting-started/api-keys
Category APIs - https://dev.wix.com/api/rest/wix-bookings/services/category/category-object
We’re working on exposing it in our Velo APIs and it will probably happen in H1 2023.
Best,
Orly