PHP KiteConnect : How to code POST BACK page?

<?php
/*See whether the request is POST or not
if the request is not POST then exit
you may echo any custom message or throw exception to debug
or you can just exit the code*/

if ($_SERVER['REQUEST_METHOD'] !== 'POST')
	{
	echo "POST Method Expected";
	return;
	}

/*we will read the POST body and store it in a variable*/
$postdata = file_get_contents("php://input");
/*next we will decode the json message body*/
$json_o = json_decode($postdata);
/*retrieve the order number and save the json response with orderid as name for future use*/
$orderid = $json_o->order_id;
$log_file = $orderid . '.json';
file_put_contents($log_file, $postdata);
/*retrieve other properties from the json*/
/*Trade Symbol*/
$trdsym = $json_o->tradingsymbol;
/*status*/
$status = $json_o->status;
/*filled price*/
$filledprice = $json_o->average_price;
/*filled qty*/
$filledqty = $json_o->filled_quantity;
/*and so on*/
/*now you got the order details.manipulate whatever you want*/
/*final step.echo success*/
echo "Success";
/*Sample Pay load from kite server
{
"order_id": "16032300017157",
"exchange_order_id": "511220371736111",
"placed_by": "AB0012",
"status": "COMPLETE",
"status_message": "",

"tradingsymbol": "TATAMOTORS",
"exchange": "NSE",
"order_type": "MARKET",
"transaction_type": "SELL",
"validity": "DAY",
"product": "CNC",

"average_price": 376.35,
"price": 376.35,
"quantity": 1,
"filled_quantity": 1,
"unfilled_quantity": 0,
"trigger_price": 0,
"status_message": "",
"user_id": "AB0012",
"order_timestamp": "2015-12-20 15:01:43",
"exchange_timestamp": "2015-12-20 15:01:43",
"checksum": "5aa3f8e3c8cc41cff362de9f73212e28"
}

You can just use the above sample payload at https://www.hurl.it to check
or debug or test your code.
Remember you need to post the payload as body.
You can create a subdomain like https://kite.yourdoamin.in
and save this php file as index.php
*/
?>