PWA O365: Accessing data in Custom data field using OData

Thanks Paul_Mather . I'm not sure what is the difference between the ProjectServer vs. ProjectData but I can't get the list of custom fields using the ProjectServer.

Anyway, I'm already using those end points that you mentioned. As noted in my original post, the issue is really with getting the values of custom fields linked to the Tasks (I..e added columns in the schedule). That's where some example or documentation of the ODATA for PWAs would be helpful.