json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Rhythmone Adapter Params",
      "description": "A schema which validates params accepted by the Rhythmone adapter",
      "type": "object",
      "properties": {
          "placementId": {
              "type": "string",
              "description": "An ID which is used to frame Rhythmone ad tag",
              "minLength": 1
          },
          "path": {
              "type": "string",
              "description": "An ID which is used to frame Rhythmone ad tag",
              "minLength": 1
          },
          "zone": {
              "type": "string",
              "description": "An ID which is used to frame Rhythmone ad tag",
              "minLength": 1
          }
      },
      "required": [
          "placementId",
          "path",
          "zone"
      ]
  }