curl --request POST \
  --url 'https://api.flashcat.cloud/rum/field/list?app_key=' \
  --header 'Content-Type: application/json' \
  --data '
{
  "scopes": [
    "session"
  ],
  "is_facet": true
}
'

{
  "error": {
    "code": "<string>",
    "message": "<string>"
  },
  "data": {
    "items": [
      {
        "field_key": "<string>",
        "field_name": "<string>",
        "value_type": "number",
        "show_type": "list",
        "description": "<string>",
        "edit_able": true,
        "enum_values": [
          "<string>"
        ],
        "scopes": [
          "session"
        ],
        "group": "<string>",
        "unit_family": "time",
        "unit_name": "nanosecond",
        "is_facet": true,
        "queryable": true
      }
    ]
  }
}