Put an account on a plan, or move it to a different one. Every location under the account gets the new plan immediately: the previous plan is closed and the new one runs to month-end. Returns the plan and how many locations were assigned.

Prerequisites: the account's id (brandId) and a plan_id set up for your partner (see List your plans).

Authentication: Partner token. The account must be inside your account tree (otherwise 404); an account of another partner returns 403. The plan must be set up for the account's partner and match its billing model (plan-based partners: plans set up by Shout About Us; usage-based partners: their own plans); otherwise 403.

Rate limit: none.