How to consume data from ProjectWise API?

Hello community,

I'm new to ProjectWise and Bentley, nice to meet you here.

I'd like to build a web application that consumes data from ProjectWise. After some googling, I discovered this  Getting Started: Bentley Web Services Gateway (WSG) 

that I need to install the Bentley web service gateway and configure stuff. 

I also noticed that we can access data from Bentley Connect through web browser, so I wonder is there a REST API for ProjectWise that developers can retrieve data?

Please advice, thank you very much!

Cheers,

Chloe