I am using below code to automate REST API. Please help me to understand how can I put whole json data for sample data mentioned below as the input has arrays whereas till now I used flat jsons without arrays

Method Dummy()
{
    RestAssured.baseURI ="http://mydummyURL";
    RequestSpecification request = RestAssured.given();
    JSONObject requestParams = new JSONObject();
    requestParams.put("id", "THAILAND"); //Issue is with this code 
    request.header("Content-Type", "application/json");
    request.body(requestParams.toJSONString());
    Response response = request.post("/EndPoint");
}

where the json body looks like this

{
    "tag1": "value1",
    "tag2": "value2",
    "tag3": {
        "tag31": "value31",
        "tag32": "value32"
    },
    "tag4": [{
            "domainName": "ABC",
            "domainId": "123ABC123",
            "domainGUID": "TestMyDomain"
        },
        {
            "domainName": "XYZ",
            "domainId": "123XYZ123",
            "domainGUID": "TestMyDomain"
        }
    ]
}