patch
https://www.signwell.com/api/v1/documents//recipients
Updates one or more recipients on a document that has already been sent. Only recipients who have not started signing may be updated. Recipient IDs must be retrieved from the Get Document response. Allowed document statuses: sent, viewed, pending, bounced. For non-embedded documents, updated recipients will receive a new notification email. For embedded signing documents, email behavior follows each recipient's send_email setting.