created_datestring date-time nullable
deleted_datestring date-time nullable
delivery_datestring date-time nullable
delivery_method'direct' | 'email' | 'emr' | 'fax' | 'passport' | 'printed'
direct_message_statusstring nullable
direct_message_tostring nullable
display_tostring nullable
document_datestring date-time
failure_unacknowledgedstring
referral_orderinteger nullable
send_to_elation_userinteger
If a letter is sent to another elation user, this will be that user's id.
send_to_namestring nullable
sign_datestring date-time nullable
signed_byinteger nullable
The user who signed the letter.
subjectstring
The subject of the letter (Not needed with referral_order).
tagsinteger[]
A list of Document Tags associated with the letter.
viewed_atstring date-time nullable