You can pay through a Credit Card, or a Bank Demand Draft (Traveler's Cheque). Consult your bank for more information on Demand Draft. And check the following link for more info.
http://www.cic.gc.ca/english/information/fees/index.asp
You are to go to your photographer and take the required specified passport photographs 6 in all and for your dd write your name and international passport no at the back of your bank draft.