They do have an API Developer Platform (https://developer.gm.com/) but you have to apply. For some other car companies, you can use www.smartcar.com.
There are some ISO compliance rules that prevent the remote start function on ICE vehicles (for example: if your car is in an enclosed space, this could be dangerous).
There are some ISO compliance rules that prevent the remote start function on ICE vehicles (for example: if your car is in an enclosed space, this could be dangerous).