I would just say "interacting with all kinds of backend services". That can be everything from OTAs to weather services, vehicle assistance services, positioni

I would just say "interacting with all kinds of backend services". That can be everything from OTAs to weather services, vehicle assistance services, positioning things, etc. Every feature of a "connected car" might be powered by a HTTP-based backend. And if the application inside the car is written in C/C++, using libcurl is a reasonable thing for interacting with those.