Canadian customs officials stamp receipts for proof of export at these nine Canadian international airports: Vancouver, Edmonton, Calgary, Winnipeg, Pearson (Toronto), Ottawa, Montréal-Mirabel, Montréal-Dorval, and Halifax.
If you leave Canada from any of these airports, go to the information counter at the Canada Customs office prior to check-in with your airline. Follow the Canada Customs signs, or signs that read "Tax Refund for Visitors to Canada."
At Toronto Pearson International Airport, Canada Customs information can be found at kiosks located on the arrivals level of all three terminals.
Terminal 1 - (905) 676-3640
Terminal 2 - (905) 676-3537
Terminal 3 - (905) 612-5416