{
    "additionalProperties": false,
    "description": "Schema for AMP user identification",
    "properties": {
        "ampClientId": {
            "description": "AMP client ID - unique to AMP user",
            "maxLength": 128,
            "type": "string"
        },
        "domainUserid": {
            "description": "Snowplow domain_userid - tracked if available",
            "maxLength": 128,
            "type": [
                "string",
                "null"
            ]
        },
        "userId": {
            "description": "User-defined user_id - tracked if available",
            "maxLength": 255,
            "type": [
                "string",
                "null"
            ]
        }
    },
    "required": [
        "ampClientId"
    ],
    "self": {
        "format": "jsonschema",
        "name": "amp_id",
        "vendor": "dev.amp.snowplow",
        "version": "1-0-0"
    },
    "type": "object"
}