import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import org.json.JSONObject;

public class MDX_RealTime {
	private String BaseUrl, ClientId, ApiKey;

	public MDX_RealTime(String BaseUrl, String ClientId, String ApiKey) {
		this.BaseUrl = BaseUrl;
		this.ClientId = ClientId;
		this.ApiKey = ApiKey;
	}

	public static void main(String[] args) throws Exception {
		String base_url = "https://int-live.moneydesktop.com";
		String client_id = ":client_id";
		String api_key = ":api_key";

		MDX_RealTime mdx = new MDX_RealTime(base_url, client_id, api_key);
		
		/// Setup Account Update json object
		String user_id = "U-39XBF7";
		String member_id = "M-39XBF7";
		String account_id = "A-XA5Y4L";
		JSONObject transaction = new JSONObject();
		JSONObject fields = new JSONObject();
		fields.put("status", "POSTED");
		fields.put("posted_on", "2017-01-21");
		transaction.put("transaction", fields);
		
		mdx.UpdateTransaction(user_id, member_id, account_id, transaction_id, transaction);
	}

	public void UpdateTransaction(String user_id, String member_id, String account_id, String transaction_id, JSONObject transaction) {
		try {
			String uri = BaseUrl + "/" + ClientId + "/users/" + user_id + "/members/" + member_id + "/accounts/" + account_id + "/transactions/" + transaction_id + ".json";
			URL url = new URL(uri);
			
			HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
			con.setRequestMethod("PUT");
			con.setRequestProperty("Accept", "application/vnd.moneydesktop.mdx.v5+json");
			con.setRequestProperty("Content-Type", "application/vnd.moneydesktop.mdx.v5+json");
			con.setRequestProperty("MD-API-KEY", ApiKey);
			con.setDoOutput(true);

			OutputStream out = con.getOutputStream();
			out.write(transaction.toString().getBytes("UTF-8"));
			out.close();

			BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
			String inputLine;
			StringBuffer response = new StringBuffer();
			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}
			in.close();
			con.disconnect();

			System.out.println(response.toString());
		} catch (Exception e) {
			System.out.println(e);
		}
	}
}

{
  "transaction": {
    "account_guid": "ACT-a341b026-635c-8318-002c-9f3a58b0eff8",
    "account_id": "A-XZ5Y4L",
    "amount": 8.2,
    "category": "GAS",
    "category_guid": "CAT-7829f71c-2e8c-afa5-2f55-fa3634b89874",
    "category_name": "Gas",
    "check_image": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==",
    "check_number": "9543",
    "currency_code": null,
    "description": "Costco (Gas)",
    "guid": "TRN-cd2987fe-9afb-e912-a5e3-2eaabb866e43",
    "id": "T-3QP5X0",
    "is_international": false,
    "latitude": "40.429675",
    "localized_description": null,
    "localized_memo": null,
    "longitude": "-111.891982",
    "member_guid": "MBR-3e4f6897-06ae-e08a-29b2-27d62e574978",
    "member_id": "M-39XBF7",
    "memo": "POS Purchase",
    "merchant_category_code": null,
    "merchant_guid": "MCH-bcd4eed1-f341-b7bb-4cbd-e2a854205306",
    "merchant_location_guid": null,
    "metadata": null,
    "posted_at": 1382961600,
    "posted_on": "2013-10-28",
    "running_balance": 345.45,
    "status": "POSTED",
    "transacted_at": 1382961600,
    "transacted_on": "2013-10-28",
    "type": "DEBIT",
    "user_guid": "USR-fe9bb059-67c4-0e6b-e8cd-3fa00b2b5735",
    "user_id": "U-39XBF7"
  }
}