Articles in this category How to swap a Mx915 PED (Black Square) (Instructions) Set the IP Address Enter DevIPReg Pre How to swap a P400 card reader (Grey Rectangle) (Instructions) Set the IP Address Press the ‘3’ and ‘X’ (Red) keys at the same time How to swap a Mx915 PED (Black Square) (Video) How to install/swap a P400 card reader (Video) Obtaining the MID/TID for a PED swap The MID is the merchant ID. This six digit ID can be found on the bottom of any in-store cashless receipt. Note that the MID will NOT display on Mobile Order receipts or Pay with App settings. To obta...