1 phase or 3 phase wallbox ?

[Coulomb]

How do I know if my car has the 3 phase charger?

When you get it, you can look into the charge port socket. If it has a three phase on-board charger, then it will have all 5 larger pins (earth, neutral, and 3 phases). Otherwise, only three will be present, like below:

Clearly, no three phase action is possible through such a socket.

I'm sorry to say that your car will probably only charge at 3.6kW, not much faster than a granny charger. This is something that ideally should have been sorted before selecting the 3-phase EVSE (AC "charger").