This call creates a multi-step invite for a document group. Each invite step consists of invite_email objects that set the email message sent in the user invites or can disable emails all together for that user. Invite steps also are made of the invite_action objects that need to be completed before the step is considered complete. Invite actions tell signNow which users should sign which document roles. Once all the invite_actions are completed, the next step's invite emails are sent out. When all steps have been completed, completion emails are sent out, which are defined by the completion_email objects. Learn more here.