{
    "type": "object",
    "required": ["validSince", "validUntil", "maxVisits"],
    "properties": {
        "validSince": {
            "description": "The date (in ISO-8601 format) from which this short code will be valid",
            "type": ["string", "null"]
        },
        "validUntil": {
            "description": "The date (in ISO-8601 format) until which this short code will be valid",
            "type": ["string", "null"]
        },
        "maxVisits": {
            "description": "The maximum number of allowed visits for this short code",
            "type": ["number", "null"]
        }
    }
}