I uploaded my mapping here: https://forums.flightsimulator.com/t/behringer-x-touch-mini-works-flawless/193140/45
For me, the trial version of SPAD.neXt was really useful, it has a list of all SimConnect Event IDs that are built into MSFS. Also has an Event Monitor, so you can press the button in the cockpit and see which event it corresponds to.
Edit: if you have any other questions about the X-Touch, we have a thread for it: https://forums.flightsimulator.com/t/behringer-x-touch-mini-works-flawless/193140