{
    "id": 140754680348890,
    "send_to_contact": {
        "id": 64062029826,
        "first_name": "First",
        "last_name": "Last",
        "org_name": "Org Name",
        "specialties": [{"id": 1335, "name": "Cardiology"}],
        "npi": "NPI2222"
    },
    "send_to_name": "Test Name",
    "fax_to": "5555555555",
    "display_to": "Test Name",
    "to_number": "5555555555",
    "subject": "Test Subject",
    "body": "Test Body Message",
    "fax_status": "success",
    "fax_attachments": true,
    "delivery_method": "printed",
    "failure_unacknowledged": false,
    "direct_message_to": "Test",
    "email_to": "test@email.me",
    "viewed_at": "2021-05-11T21: 16: 23Z",
    "send_to_elation_user": 1234,
    "delivery_date": "2021-05-11T21: 16: 23Z",
    "with_archive": false,
    "is_processed": true,
    "letter_type": "provider",
    "attachments": [
        {
            "id": 64414089501,
            "document_type": "MedsList"
        }
    ],
    "sign_date": "2021-05-11T21: 16: 23Z",
    "signed_by": 12323455,
    "tags": [],
    "document_date": "2021-05-11T21: 16: 23Z",
    "patient": 140754680086529,
    "practice": 140754674450436
}

Attribute	Type	Allowed Values	Description
id	bigint(20)		ID
send_to_contact	object
send_to_contact.id	int(11)
send_to_contact.first_name	string
send_to_contact.middle_name	string
send_to_contact.last_name	string
send_to_contact.org_name	string
send_to_contact.npi	string
send_to_contact.specialties	list
send_to_contact.specialties[].id	int(11)
send_to_contact.specialties[].name	string
send_to_elation_user	int(11)		If a letter is sent to another elation user, this will be that user's id.
send_to_name	string
fax_to	string
display_to	string
to_number	string
subject	string(200)
body	longtext
fax_status	string	"pending", "success", "failed"
fax_attachments	bool
delivery_method	string	"emr", "passport", "fax", "email", "printed", "direct"
failure_unacknowledge	bool
direct_message_to	string(200)
email_to	string(200)
viewed_at	datetime
send_to_access_user_id	int(11)
delivery_date	datetime
with_archive	bool
is_processed	bool
letter_type	string	"patient_initiated", "patient", "referral", "provider"
attachments.id	int
attachments.document_type	string	"Entity", "RefPanel", "PatientDemog", "ImmHistory", "MedsList", "WhoHeightChart", "WhoWeightChart", "WhoHcChart", "CdcHeightChart", "CdcWeightChart", "CdcBmiChart", "CompMedsList", "CdcHcChart",
sign_date	datetime
signed_by	int(11)		The user who signed the letter.
tags	list[Document Tag]		A list of Document Tags associated with the letter.
document_date	datetime
patient	int
practice	int