This event is fired when a fax is received.
|EventType||string||Has the value “fax_received” for this event|
|fax_id||string||Unique identifier for this fax|
|from||string||E164 formatted phone number this fax was sent from|
|to||string||E164 formatted phone number this number was sent to|
|date||string||ISO 8601 formatted date string|
|api_details_url||string||The URL to this fax in the Telzio api|
|api_download_url||string||The URL this fax can be downloaded in PDF format from|