Be careful. The way cards work in Canada is pay in full or pay interest on the entire thing.
I learnt that the hard way once when paying off a ~$5000 bill from two accounts. My large bill was trip related too :)
I was off by $200. I caught my mistake 2 days after the due date & thru $400 just to be sure.
The next bill had almost $100 in interest charges. interest was on the full $5000 for about 6 weeks, since that is when the first purchase was made. Actually, the first purchase was 6 weeks, the second 6weeks minus a few days & so on. It takes excel to figure out the exact interest charges.
So sure, I would of had about 55 days grace on that first purchase, but screw up by 2 days and get dinged the entire thing.
I was livid because I felt like I was being charged $100 interest on just $200 for 2 days.
Fortunately, I called & they refunded me the interest, but what an embarrassing hassle.