The authority, exactly
This visa does not exist on a job offer alone. Immigration New Zealand runs it as three separate approvals: the employer applies for and holds AEWV accreditation; the employer then applies for a job check on the specific role, valid for 6 months or until the accreditation itself ends, whichever comes first; only once the job check is approved does the migrant apply for the visa. Check Immigration New Zealand's accredited employer list before relying on any job offer — an employer who has not completed the first step cannot support this visa at all.