Now that I don't use the card.....
It's easier if you have over $650 but I've done it for the $350&$150 level too.
Simply create an account at hotels.ca and make a booking for as close to $350 as you can. With taxes added AFTER this can take a while, you have to play with # of days,locations and a new wrinkle "pay now" (not at the hotel!!). And obviously 100% refundable. Book a pay now stay and then go cancel the booking. I usually waited 30 seconds
. A few days later the travel charge and credit will show up as separate items. Just go into the reward engine and choose the hotel.ca charge and process the credit.
The last one I used was for $148.50.