Uisng Libcamera with raspberry pi cameras in C

Hi, I am trying to use libcamera to do a stereo depth project through C. I am reading through the documentation and to initialise the camera it looks like I need a ID, streams and a unique pointer. I am unsure where to get the unique ID for the camera. Can anybody help me??

Please post text as text and not as pictures. And there is help in the https://discord.com/channels/818384379197784084/1189386838788542464 how to format it.