How to use AMSI_UAC_REQUEST_TYPE?

Question

Recently I implemented an Antimalware Scan Interface (AMSI) provider to intercept script execution, and scan script content before it executed. I based my code on the Microsoft sample AMSI provider. (Github).

In amsi.h I found AMSI_UAC_REQUEST_TYPE enum with very interesting fields:

typedef enum AMSI_UAC_REQUEST_TYPE
{
    AMSI_UAC_REQUEST_TYPE_EXE   = 0,
    AMSI_UAC_REQUEST_TYPE_COM   = 1,
    AMSI_UAC_REQUEST_TYPE_MSI   = 2,
    AMSI_UAC_REQUEST_TYPE_AX    = 3,
    AMSI_UAC_REQUEST_TYPE_MAX   = 4
}   AMSI_UAC_REQUEST_TYPE;

But I can't understand how to utilize it. Which callback should I use to intercept UAC request?