Member Roles
Use theroles array when adding account members through Add Account Members or Create Account. AccountMember.type is deprecated and remains supported for compatibility. Replace a member’s "type": "AUTHORIZED_USER" with "roles": ["AUTHORIZED_USER"] in your requests, and read roles in account member responses.
Account members link identities to accounts. Institution members link person identities to institutions and use a separate set of roles. See the migration guide for the distinction.