InDesign C++ SDK: How to Programmatically Create or Resize Primary Text Frame?

I’m currently working on a project that involves programmatically resizing the primary text frame in Adobe InDesign, and in some cases, creating one if it doesn’t already exist. I’ve reviewed the InDesign C++ SDK documentation, but I haven’t found any clear guidance or relevant interfaces that address how to create or resize the primary text frame using the SDK.

Could someone please clarify:

• Is it possible to programmatically create or resize the primary text frame using the InDesign C++ SDK?
• If so, which interfaces and methods should be used to accomplish this?

Any examples, pointers, or references to relevant SDK classes or sample code would be greatly appreciated.

Thank you!