Reads a single Allowance stat

get https://api.factorialhr.com/api/v2/resources/timeoff/allowance_stats/{id}

This endpoint retrieves the employee time off counters for a specific allowance with a reference date

employee_id: The Id of the employee we want to check
allowance_id: Id of the allowance for which we want to check the counters. The employee must belong to a time off policy that has this allowance.
reference_date: The date for which we want to check the counters. It helps answer the question: On this date, how did the employee counters look like?