I need to put one of the waypoint directly in sequence of another, for example: waypoint7 must be directly after waypoint2 e the rest of the waypoints must be organized with the best automatically order given by the API.
Fleet Telematics provides Sequence constraints between pairs of waypoints define a partial order which is strictly obeyed. Add ;before:destination13 to the waypoints in the request parameters to define sequence constraints. Several 'before's are allowed per way point.
To specify that waypoint 7 must be reached before way point 3, use:
destination7=FrankfurtAirport;50.050639,8.569641;before:waypoint3;st:0
https://developer.here.com/documentation/routing-waypoints/topics/optimizing-waypoints.html
Hope this helps.!