An example of a response to a request for additional information

{
  "resourceType": "Communication",
  "id": "fm-solicited",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">Attachment in response to a Request</div>"
  },
  "contained": [
    {
      "resourceType": "Organization",
      "id": "provider",
      "identifier": [
        {
          "system": "http://www.jurisdiction.com/provideroffices",
          "value": "3456"
        }
      ]
    },
    {
      "resourceType": "Organization",
      "id": "payor",
      "identifier": [
        {
          "system": "http://www.jurisdiction.com/insurer",
          "value": "123456"
        }
      ]
    },
    {
      "resourceType": "CommunicationRequest",
      "id": "request",
      "identifier": [
        {
          "system": "http://www.jurisdiction.com/insurer/123456",
          "value": "ABC123"
        }
      ],
      "status": "completed",
      "intent": "proposal",
      "subject": {
        "reference": "Patient/1"
      }
    }
  ],
  "identifier": [
    {
      "system": "http://www.providerco.com/communication",
      "value": "12345"
    }
  ],
  "basedOn": [
    {
      "reference": "#request"
    }
  ],
  "status": "completed",
  "category": [
    {
      "coding": [
        {
          "system": "http://acme.org/messagetypes",
          "code": "SolicitedAttachment"
        }
      ]
    }
  ],
  "subject": {
    "reference": "Patient/1"
  },
  "sent": "2016-06-12T18:01:10-08:00",
  "recipient": [
    {
      "reference": "#payor"
    }
  ],
  "sender": {
    "reference": "#provider"
  },
  "payload": [
    {
      "contentAttachment": {
        "contentType": "application/pdf",
        "data": "SGVsbG8=",
        "title": "accident notes 20100201.pdf",
        "creation": "2010-02-01T11:50:23-05:00"
      }
    },
    {
      "contentAttachment": {
        "contentType": "application/pdf",
        "url": "http://happyvalley.com/docs/AB12345",
        "size": "104274",
        "hash": "SGVsbG8gdGhlcmU=",
        "creation": "2010-02-01T10:57:34+01:00"
      }
    }
  ]
}