{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "$id": "https://www.computop-paygate.com/schemas/phone.json",
    "title": "Phone",
    "description": "Telefonnummer",
    "type": "object",
    "properties": {
        "countryCode": {
            "type": "string",
            "minLength": 1,
            "maxLenght": 3
        },
        "subscriberNumber": {
            "type": "string",
            "maxLenght": 12
        }
    },
    "required": ["countryCode", "subscriberNumber"],
    "additionalProperties": false
}

{
  "countryCode": "33",
  "subscriberNumber": "12345678910"
}