Here is the procedure to order GCMS:
Fill out these two forms; One has to be filled out by your spouse in Pakistan (Ask them to scan and email it to you after they fill it out and sign it).
1 - Form name IMM5475E
http://www.cic.gc.ca/english/pdf/kits/forms/IMM5475E.pdf
2 - Form name IMM5563E
http://www.cic.gc.ca/english/pdf/kits/forms/IMM5563E.pdf
IMM5475 needs to be filled out by the person who is being sponsored. IMM5563 needs to be filled out by the sponsor.
Pay the fee online and select Access to Information and pay with your credit card. You will have to register with them, just provide your email and confirm password; its that easy !!!
https://eservicesak.cic.gc.ca/epay/welcome.do?lang=en
You can save the receipt or print it. They will email you a copy on your email address as well.
Scan and attach both forms along with the payment receipt and send it to atip-aiprp @ cic.gc.ca with GCMS ORDER in your subject. In the body, just write your name, File number and email address