In the original instructions @jofemodo told us:
The color code for the harness is:
Green → D+
White → D-
Red → VCC (5V) → Unconnected. Take care of short circuit with some tape!
Black → Ground → Unconnected. Take care of short circuit with some tape!
The 5V and Ground connections to the female USB B connector are not cut by our surgery, so they don’t need to soldered from the USB C harness.
This is from thread: