IDTech Windows SDK Guide  1.2.172.2
API reference for UniPay 1.5
Initialize UniPay 1.5:

A Singleton instance has been established in the IDT_UniPayI_V class. Establish the callback, and then access the UniPay 1.5 through USB via the SharedController instance.

public UniPay 1.5_Simple_Demo()
{
InitializeComponent();
IDT_UniPayI_V.setCallback(MessageCallBack);
}