Typically written confirmation of membership and good standing on its letterhead, the registration number, the date the designation was granted, and its current status. Ask whether it can send confirmation directly and whether a public register entry can be verified online.
Prefer records issued by the body itself
A certificate hanging in an office establishes that the designation was granted; a current good-standing letter establishes that it still stands. Both are useful and they answer different questions. Where the body maintains a public register, note the entry and how it can be checked, since an independently verifiable source reduces the need to rely on copies. Request several originals if the body issues them.
Ask for a transcript and degree confirmation showing the name on the original diploma alongside the current institutional name. Organize each professional’s citizenship, duties and credentials so the records can be assessed separately. Keep the credential itself, any provincial licence with its issuing body and, where the regulation requires it, a foreign-credential evaluation. Eligibility still rests on Canadian or Mexican citizenship, qualifying prearranged work and the category's own education or experience standard; permanent resident status in Canada cannot replace nationality.
Record the authentic day rate because remuneration helps explain the engagement, but do not present it as proof of professional status.