Transação com Token

{
   "referenceId": "19893211234",
   "amount": "1000",
   "description": "Mouse sem fio",
   "customer": {
      "name": "Comprador Teste",
      "document": "12345678909"
   },
   "payment": {
       "card": {
          "type": 1,
          "capture": false,
          "installments": 1,
          "interestType": 3,
          "authenticate": 3,
          "softDescriptor": "Pagamento GATE2all",
          "recurrent": false,
          "cardInfo": {
              "token": "4b6a2aa5-de91-4d52-a4d1-f265f208e5a321"
          }
       }
   }
}

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;

URL obj = new URL("https://api.gate2all.com.br/v1/transactions");
HttpURLConnection con = (HttpURLConnection) obj.openConnection();

con.setRequestMethod("POST");
con.setRequestProperty("content-type", "application/json");
con.setRequestProperty("authenticationApi", "demo");
con.setRequestProperty("authenticationKey", "demo");

String body = "{"
      + "\"referenceId\": \"123456789\","
      + "\"amount\": \"1000\","
      + "\"description\": \"TV LG 42\","
      + "\"postBackUrl\": \"http://requestb.in/qkg1clqk\","
      + "    \"customer\": {"
      + "        \"name\": \"LUIS A R ROMERO\","
      + "        \"document\": \"12345678909\""
      + "   },"
      + "    \"payment\": {"
      + "        \"card\": {"
      + "           \"type\": 1,"
      + "           \"capture\": true,"
      + "           \"installments\": 1,"
      + "           \"interestType\": 3,"
      + "           \"softDescriptor\": \"EC02\","
      + "           \"cardInfo\": {"
      + "               \"token\": \"7a7820d0-ff6d-484a-8b8e-988d6d0ec0cc21\""
      + "           }"
      + "        }"
      + "    }"
      + "   "
      + "}";

con.setDoOutput(true);
DataOutputStream dos = new DataOutputStream(con.getOutputStream());
dos.writeBytes(body);
dos.flush();
dos.close();

Scanner scanner = new Scanner(new BufferedReader(new InputStreamReader(con.getInputStream())));
String response = scanner.nextLine();
scanner.close();

System.out.println(response);