How can I get all the Holidays without employee ID

How can I get all the Holidays without employee ID

How can I get all the holidays via Zoho People API without providing employee ID?.
I tried this without userId parameter and it gives me an error.

https://people.zoho.com/people/api/leave/getHolidays?authtoken=<token>&userId=<userId>

My company has 2 locations and I want to get the list of all the holidays in both locations regardless of the employee. How can I achieve this?