To determine the free seats for a route and block them temporarily, you must perform a GET call with the following parameters:
Mandatory parameters
- ** action**: 
getSitzplatz(Specifies the action) - ** class_id**: ID of the booking class
 - ** ship_id**: ID of the resource
 - ** start_line_port_id**: ID of the start station in the line-port table
 - ** stop_linie_hafen_id**: ID of the destination station in the line-port table
 - ** trip**: Number of the trip
 - ** line_id**: ID of the line
 - ** seat_plan_category_id**: ID of the seating plan category (value from the field "schiff_sitzplan_kategorie_id" from the timetable result)
 - ** token**: XML token (provided by the provider)
 - ** datum_fahrt**: Date of the trip as Unix timestamp (Attention: Use the date from the request array. For multi-day lines, the start date of the first stop)
 
Return values
- If there is no result, an empty array is returned.
 - If the call is successful, you will receive a multidimensional array in which the ** occupied** node contains the occupied seats (the key is the seat number), and ** seats** contains the total available seats for the request.
 
Example call
xml.php?action=getseat&token=xyz&line_id=3&class_id=3&trip=2&date_trip=1580857200&start_line_port_id=9&stop_line_port_id=15&seat_category_id=1