> ## Documentation Index
> Fetch the complete documentation index at: https://plain-docs-orca-916-agent-docs-restructure.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# updateCompanyTier

> Sets the tier for a single company, identified by its Plain ID or domain name. Pass a null `tierIdentifier` to remove the company from its current tier. Use `addMembersToTier` when you need to move multiple companies at once. Requires the `tierMembership:read` and `tierMembership:create` permissions.