He pays you.
You get his RPAL info.
You hold certificate in your hand.
You call, tell them you want to start a transfer
They ask for serial number and maybe other details (on certificate)
They give you a transfer number
You give that to buyer
He completes the transfer
Deliver item to happy buyer by person or Canada Post.
Signature required, insurance as per buyer request as it’s no longer yours at that point.