We'll need access the USB port on the CPX once it is embedded inside the arcade button. So we'll need to DIY a USB cable so that we can still connect the CPX. We'll need five wires to create a micro USB cable.
I suggest using 30AWG silicone coated wires. Different colored wires allows you to tell the connections apart from each other. Using wire stripper, remove a bit of insulation from each wire. To prevent the strands of wires from fraying, you can add a bit of solder to tin them.
We'll need to solder these wires to the male micro USB connector. Due to the tiny pads, this can be quite difficult – A pointy tipped soldering iron is recommended. Follow the circuit diagram to get the proper connections.