API: Extension of the Add subscriber method

In the Add subscriber method, we have expanded the capability to identify subscriber attributes not only by ID but also by their name:

The ID will still be the primary parameter by which we identify the attribute.

Duplicate attribute values will be detected even if the question uses both ID and attribute names.

If the question lacks both ID and attribute names, you will receive an error message.

If you provide an incorrect attribute ID, you will receive an error message.