Returns the number of trips grouped by vehicle model and date.

This endpoint counts the number of trips performed by the trackers of a given company or group and returns the counts grouped by the vehicle model and date.
The call must include either the company_oid or the group_oid as your identifier.
Furthermore, it is necessary to specify the parameter step, which indicates the period of time used for grouping (days, weeks, months, quarters, years).
Optionally, the call can include the following parameters:

• start_date and end_date. These parameters limit the time period of interest, i.e. only trips that fall between these dates will be counted.
  If the end_date is omitted, the list will include all the trips from the start_date until now.
  If both dates are omitted, the list will include the trips of the last seven days.