Upsert a company group

Creates or renames a single company group in one endpoint. Pass id to rename the matching existing group; omit id to create a new one. A create responds 201, an update responds 200. Company groups are the labels you use to organize your business relationships (customers and vendors); price tiers can target or exclude companies by group.

name is required and must be unique within your company — reusing a name already taken by another of your groups is rejected with a 400. On update, name fully replaces the stored name; there are no other editable fields, so this endpoint only ever sets the group's name.

Renaming a group does not change its ID, so any price tier that already targets or excludes this group keeps doing so under the new name. Creating a group does not attach it to any company relationship — membership is managed separately.

Required permission: settings_permissions_company_relationship_groups.