{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ExternalId",
  "title": "ExternalId",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "The value of the external ID."
    },
    "type": {
      "type": "string",
      "description": "The type of external ID.",
      "enum": [
        "user_id",
        "anonymous_id",
        "email",
        "phone",
        "cross_domain_id",
        "android.id",
        "android.idfa",
        "ios.id",
        "ios.idfa"
      ]
    },
    "source_id": {
      "type": "string",
      "description": "The source that provided this external ID."
    },
    "collection": {
      "type": "string",
      "description": "The collection this external ID belongs to."
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "When this external ID was first seen."
    },
    "encoding": {
      "type": "string",
      "description": "The encoding of the ID value."
    }
  }
}