Creating inputs and outputs for node groups in Blender 4.0 using the Python API

In Blender 3.6 and earlier, inputs and outputs for node groups could be created by calling the new() command for the list of inputs or outputs of the node tree. In Blender 4.0, the developers made changes, and the creation of input and output sockets for node trees was moved to the "interface" object.

Read more: https://b3d.interplanety.org/en/creating-inputs-and-outputs-for-node-groups-in-blender-4-0-using-the-python-api/