request format for sending data (lat, lon) to traccar

hi
i have a problem that: i dont know, what is the correct format of requesting to traccar.
if i want to clear my problem : how can i ARRANGE THE HEADER , DATA , ... in getting request , that traccar can get it ??
MY PURPOSE IS SENDING LAT,LON USING CURL(LIBRARY FOR REQUESTING) in correct format of header or data??
thank for any help

https://www.traccar.org/protocols/