Only a qualified individual, i.e. a Canadian Citizen, a Permanent Resident or a person in Canada, with valid documents can make a request on your behalf for GCMS notes or any other information from a Canadian government entity.
Under subsection 4(1) of the ATIA, Canadian citizens, permanent residents, individuals who are present in Canada (but who are not Canadian citizens or permanent residents), and corporations present in Canada have a right of access.
Requesters who are not Canadian citizens or permanent residents must be physically in Canada both at the time they make their request for access and at the time access is given.