Q. What is an MPIN in GCASH?

The Mobile Personal Identification Number or MPIN is a four-digit passcode that you will use for all your GCash transactions. This will be asked upon registration through the GCash App, Messenger, or USSD. For your protection, do not share your MPIN and delete all messages containing your MPIN immediately. (https://help.gcash.com/hc/en-us)