custom-fields.json

[
  {
    "key": "field1",
    "help_text": "This field has a parent_key",
    "type": "unicode",
    "parent_key": "transaction"
  },
  {
    "key": "field2",
    "help_text": "This field does not have a parent_key.",
    "type": "unicode",
    "send_in_json": true
  }
]