* with a mobile phone * who is a resident of Canada (no, you don’t even need to be a citizen, just a permanent resident in Canada)
from the liberals bylaws: https://liberal.ca/wp-content/uploads/sites/292/2020/09/by-law-4-2.pdf To be eligible for Registration in the Party, a person must: (a) be at least fourteen (14) years of age; (b) support the purposes of the Party; [duh] (c) ordinarily live in Canada or, for Canadians living abroad, be qualified as an elector who may vote in accordance with part 11 of the Canada Elections Act; [slightly more broad than the above strictly speaking but probably legal] (d) not be a member of any other federal political party in Canada; and (e) while Registered as a Liberal, not have publicly declared an intention to be a candidate for election to the House of Commons other than as a candidate of the Party
And any of this you can do without any vetting from the party at all. Very difficult to unwind foreign shitposter votes from blue haired cat lady votes.