Here is a copy +paste from another member with thanks:-
If sponsor is requesting it on behalf of Principal applicant, you need consent form from PA and $5 fee. You can receive consent form from spouse via email and upload it.
Apply under Access to Information Act.
It takes about 30 days to receive by email. It is a ~30 pages document (can be more than 30 pages)
Consent form:
http://www.cic.gc.ca/english/department/atip/form-imm5744.asp
Section A - Principal Applicant details
Section B - Sponsor's details
Section C - Sponsor's details
GCMS Notes:
http://www.cic.gc.ca/english/department/atip/requests-atip.asp
In above link, click Apply online, choose English , hit Next and accept the terms & conditions.
Next enter the below details:
Requester Information
Department: Citizenship and Immigration Canada
Title:
Family Name:
Given Name(s) (First Name):
Mailing Address:
Telephone No.:
E-mail Address:
Requesting information on your own behalf? Yes / No
Category of Requester: Member of the Public
Right of Access: Canadian citizen, a permanent resident of Canada or Individual/corporation currently present in Canada
Method of Delivery: E-mail