Mapbox Project with Transit information.

Hi Guys I was hopeing someone with expoerience with mapbox would be able to give me afew pointers on how to get started with this project I have been tasked with.

I am going to make an app the will show a route from point A to point B on a map. Mapbox is great for this and it also has AR functionality that I plan on implamenting.

I'm getting confused on how to approach the transportation element of the app. I need the line drawn on the map from A to B to take into consideration transportation routes like busses or trains. Mapbox has said it supports linking in with other transit API's.

I would be greatful is anyone knew of any tutorials that detaild how to link mapbox up to these API's or if anyone has any knowledge thet could pass onto me about this.