CreateAccountMembershipInput

accountId ID!	The unique identifier of the account (company)
creatorUserId ID	The unique identifier of the user who is inviting a new user to join an account
roles [AccountMembershipRole!]	The roles to be granted to the new user within the account
firstName String	User's first name
lastName String	User's last name
idpId String	The unique identifier of the external identity provider that this user is associated with
externalId String	External identifier of the user
username String	Username of the user
email String	Email address of the user
sendInvitation Boolean	Whether this user is to be sent an invitation to join the account, or is instead assigned to the account immediately Default value: true

Add a new or existing user as a member of a marketplace account (company)