json - JsonBuilderを使用して、groovyで既存のJSONを作成する方法は?

Question

以下のJSONに変換できるオブジェクトの定義(構造)を探しています

 {
    "header":{
        "callbackUrl":"",
        "clientOrderId":"A565132",
        "clientOriginationId":"2345FE",
        "serviceProvider":"VERIZON",
        "transactionId":"EEDT44567"
    },
    "customer": {
        "nationalIdType":"",
        "nationalId":"",
        "addresses":[
            {
                "type":"WORK",
                "postalCode":"330066"
            }
        ],
        "serviceProviderAuthentication":[
            {
                "passcode":"",
                "securityQuestion":"",
                "securityAnswer":""
            }
        ]
    },
    "accountPhoneNumber":"",
    "accountNumber":""
}