Get custom field

{
  "classCode": "INCIDENT",
  "description": "test case for check box",
  "displayLabel": "checkbox-api-lab",
  "editable": true,
  "fieldType": "TYPE_CHECKBOX",
  "id": "UDF0000003794",
  "mandatory": false,
  "name": "checkbox_api_lab_3794",
  "options": [
    {
      "label": "yes",
      "value": "1"
    }
  ]
}

{
  "classCode": "INCIDENT",
  "description": "test case for date field",
  "displayLabel": "Date-ap-lab",
  "editable": true,
  "fieldType": "TYPE_DATE",
  "id": "UDF0000003795",
  "mandatory": false,
  "name": "date_ap_lab_3795"
}

{
  "classCode": "INCIDENT",
  "description": "test case for Date and time",
  "displayLabel": "dateTime-api-lab",
  "editable": true,
  "fieldType": "TYPE_DATETIME",
  "id": "UDF0000003796",
  "mandatory": false,
  "name": "datetime_api_lab_3796"
}

{
  "classCode": "INCIDENT",
  "description": "Test case",
  "displayLabel": "drop-down-api-lab",
  "editable": true,
  "fieldType": "TYPE_DROPDOWN",
  "id": "UDF0000003790",
  "mandatory": false,
  "name": "drop_down_api_lab_3790",
  "options": [
    {
      "label": "first",
      "value": "1"
    },
    {
      "label": "second",
      "value": "2"
    }
  ]
}

{
  "classCode": "INCIDENT",
  "description": "numeric test case",
  "displayLabel": "Numeric-api-lab",
  "editable": true,
  "fieldType": "TYPE_NUMBER",
  "id": "UDF0000003793",
  "mandatory": false,
  "name": "numeric_api_lab_3793"
}

{
  "classCode": "INCIDENT",
  "description": "test case for text field",
  "displayLabel": "text-api-lab",
  "editable": true,
  "fieldType": "TYPE_TEXT",
  "id": "UDF0000003791",
  "mandatory": false,
  "name": "text_api_lab_3791"
}

{
  "classCode": "INCIDENT",
  "description": "test case for multi line text",
  "displayLabel": "multi line text-api-lab",
  "editable": true,
  "fieldType": "TYPE_TEXTAREA",
  "id": "UDF0000003792",
  "mandatory": false,
  "name": "multi_line_text_api_lab_3792"
}