Link: http://retail.petro-canada.ca/en/petropoints/2841.aspx

Petro-Points and itravel2000 have teamed up, and now you can earn and redeem points on travel when you book with itravel2000 and use your Petro-Points card. You earn 10 points for every $1 you spend
on travel (with conditions of course). And double the points when you
use their Petro-points MasterCard. Book by the 15th of May and get a bonus 10,000 points!

Follow up:

You can also redeem petro-points and use them to purchase at iTravel2000.

10,000 pts	$10
25,000 pts	$25
100,000 pts	$100
500,000 pts	$500

So, if you book a vacation that is $1000, you get 10,000 Petro points. That in turn is worth $10 off, or a grand total discount of just .1%. Not a great discount.

And now the itsy bitsy contractual rules they don't want you to read...
Points are earned on all transactions excluding taxes.
When booking redemptions over the phone you must provide a major credit card number.
itravel2000will guarantee the lowest price at the time of booking upon being provided with factual documentation including price and availability of competing offer and will not be lowered when booking is completed.