Access completed form fields in ServiceM8

I am trying to access completed form field data in ServiceM8 including uploaded images. The api reference does not detail how to access them. Can anyone provide an example or documentation?

It's not publicly documented, but you can access completed forms via the FormResponses endpoint.

https://api.servicem8.com/api_1.0/FormResponse.json

[{
  "edit_date": "2015-02-17 11:12:22",
  "active": 1,
  "form_uuid": "578344cc-8d57-441b-a713-02207430f7cb",
  "staff_uuid": "",
  "regarding_object": "job",
  "regarding_object_uuid": "8b9bfe73-c43c-4275-bb4e-1aac9b6f8adb",
  "field_data": "removed (see below)",
  "timestamp": "2015-02-17 11:12:20",
  "form_by_staff_uuid": "0e72af0f-22db-4ddb-ac7d-eba2c1ef2d4b",
  "document_attachment_uuid": "6b73bfa3-3dd8-48b7-83b2-af1dcc78262b",
  "uuid": "ff1926c8-8879-41a5-9f2d-e4e4455e92eb"
}]

The actual responses to the questions are in the field_data property, which is itself a JSON-encoded string. Here's an example:

[
  {
    "UUID": "1ea64222-2b0e-4dc4-a99b-698603a9f59b",
    "FieldType": "Date",
    "Response": "Tue Feb 17 2015 00:00:00 GMT+0930 (ACST)",
    "SortOrder": 1,
    "Question": "Date"
  },
  {
    "UUID": "9b4ea087-d154-4fb7-831e-c17cb882157b",
    "FieldType": "Multiple Choice",
    "Response": "Blah",
    "SortOrder": 2,
    "Question": "Supplier"
  },
  {
    "UUID": "24fdd846-8fc8-4ddf-9d58-6c5fa1b5310b",
    "FieldType": "Text",
    "Response": "1",
    "SortOrder": 3,
    "Question": "Part 1 Qty"
  },
  {
    "UUID": "6162749f-5945-455c-95ca-ca31e9bd6a7b",
    "FieldType": "Text",
    "Response": "p1",
    "SortOrder": 4,
    "Question": "Item Part No. 1"
  },
  {
    "UUID": "fd5c8f67-c68d-4dcb-96a7-05341fbb3dab",
    "FieldType": "Text",
    "Response": "part one",
    "SortOrder": 5,
    "Question": "Item Name 1"
  },
  {
    "UUID": "6e591103-78d4-42a0-8657-5229b5b469fb",
    "FieldType": "Photo",
    "Response": "cf91bae2-b9da-42e2-87ee-b416109bb44b",
    "SortOrder": 14,
    "Question": "Take Photo of Items 1"
  },
  {
    "UUID": "c8719af5-b550-40cf-9d83-0ea67ab30e5b",
    "FieldType": "Signature",
    "Response": "90ac5b56-fc0e-4a3a-8935-f43cdd23c05b",
    "SortOrder": 17,
    "Question": "Signature"
  }
]

For photo questions (FieldType == Photo), the Response property contains a UUID which you can retrieve from the Attachments endpoint.

JSON data for the attachment: https://api.servicem8.com/api_1.0/Attachment/cf91bae2-b9da-42e2-87ee-b416109bb44b.json

File data (i.e. the attachment itself): https://api.servicem8.com/api_1.0/Attachment/cf91bae2-b9da-42e2-87ee-b416109bb44b.file