json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Advangelists Adapter Params",
      "description": "A schema which validates params accepted by the Advangelists adapter",
      "type": "object",
      "properties": {
          "pubid": {
              "type": "string",
              "description": "An id used to identify Advangelists publisher.",
              "minLength": 8
          },
          "placement": {
              "type": "string",
              "description": "An id used to identify placements."
          }
      },
      "required": [
          "pubid"
      ]
  }