I know there are two commands Convert To Brep and Convert To Mesh that I can use to do obtain a brep or a mesh, howerver what I am looking for is for the points which generate the rebar.
If you need the physical points on the rebar itself (that take into account cover thicknesses etc) you can use the GetRebarGeometries method (https://developer.tekla.com/tekla-structures/api/22/15004). This is also needed to get the points of individual bars in e.g. a rebar group.
Here’s a C# component that uses this method to obtain the polylines of individual bars from any rebar type: