Counts how many staff members match the given filter.
Counts only staff members who are service providers. To count the business's entire staff,
including staff members who don't provide services, pass a serviceProvider filter or call
Count Staff Members V2.
For the fields you can filter by, see Filtering and Sorting.
To learn about working with filters in general, see API Query Language.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.