I'm getting error while executing REST API automation. How to resolve it?

My code is:

package demo1;
import io.restassured.RestAssured;
import static io.restassured.RestAssured.*;
import static org.hamcrest.Matchers.*;

import demo1.Files.PayLoad;
public class PostMethodEx1 {

    public static void main(String[] args) {
     //to validate if add place api is working as expected.
        //given-->all input details
        //when-->submit the API
        //then-->validate the response
        RestAssured.baseURI="https://rahulshettyacademy.com";
        String response=given().log().all().queryParam("key", "qaclick123").header("Content-Type","application/json")
        .body(PayLoad.addPlace())
        .when().post("maps/api/place/add/json")
        .then().assertThat().statusCode(200).body("scope", equalTo("APP"))
        .header("Server", "Apache/2.4.18 (Ubuntu)").extract().response().asString();
        
        System.out.println(response);
        
    }

}

Payload class code is:

package demo1.Files;

public class PayLoad {
  public static String addPlace(){
    
      
      return "{\\r\\n\" + \r\n" + 
            "               \"  \\\"location\\\": {\\r\\n\" + \r\n" + 
            "               \"    \\\"lat\\\": -38.383494,\\r\\n\" + \r\n" + 
            "               \"    \\\"lng\\\": 33.427362\\r\\n\" + \r\n" + 
            "               \"  },\\r\\n\" + \r\n" + 
            "               \"  \\\"accuracy\\\": 50,\\r\\n\" + \r\n" + 
            "               \"  \\\"name\\\": \\\"Akshay-MG\\\",\\r\\n\" + \r\n" + 
            "               \"  \\\"phone_number\\\": \\\"(+91) 983 893 3937\\\",\\r\\n\" + \r\n" + 
            "               \"  \\\"address\\\": \\\"29, side layout, cohen 09\\\",\\r\\n\" + \r\n" + 
            "               \"  \\\"types\\\": [\\r\\n\" + \r\n" + 
            "               \"    \\\"shoe park\\\",\\r\\n\" + \r\n" + 
            "               \"    \\\"shop\\\"\\r\\n\" + \r\n" + 
            "               \"  ],\\r\\n\" + \r\n" + 
            "               \"  \\\"website\\\": \\\"http://google.com\\\",\\r\\n\" + \r\n" + 
            "               \"  \\\"language\\\": \\\"French-IN\\\"\\r\\n\" + \r\n" + 
            "               \"}";
      
  }
    
    
    
}

Error I am getting is: Exception in thread "main" groovy.json.JsonException: Lexing failed on line: 1, column: 1, while reading '<', no possible valid JSON value or punctuation could be recognized.