//==== Verify Transaction Using IPN ======
//==== Please login your cashmaal account and add IPN URL in merchant settings (Without Adding IPN url this function will not work) ======
//==== Please Note that you will get IPN in same currency which you will ask for pay user ======

/*
-----------------------------------------------------------
Here is all response Data Sample: 

Command: print_r($_POST); 

Command response: {"status":"1","web_id":"6","CM_TID":"CK858BZ9416","Amount":"0.5","currency":"USD","fee":"0","client_email":"tech@cashmaal.com","order_id":"510561948","date_time":"02-06-2019 10:53:22 AM","addi_info":"For Ads","ipn_key":"A39KxWfeCk9bw4ztNa3ydqfg7qbvOioQb52"}
-----------------------------------------------------------
POST IPN response Details: 

status: 1 (Successfull) | 2 (Pending) | 3 (Rejected) | 0 (Cancelled)
web_id: (Your Web Id) (You can check your web id from merchant settings in cashmaal account)
CM_TID: (cashmaal Transaction Id)
Amount: (Amount with you have received)
currency: (currency Which user Paid)
fee: (fee on your amount)
client_email: (User Email which you have send us in POST data)
order_id: (Order_Id which you have send us in POST data)
date_time: (Transaction DateTime)
addi_info: (Additional information which you have send us in POST data)
ipn_key: (Your IP key for match with your cashmaal account ipn_key)
-----------------------------------------------------------
*/




//---------------------- PHP sample for IPN 
<?php

$IPN_key="";   // Your IPN Key here (You can get IPN Key from Your cashmaal Account (Merchant settings Tab)) 

if($_POST['ipn_key'] == $IPN_key){ // Now ensured this is real post data



if($_POST['status'] == 1){ // Now ensured your have received this payment

$CM_TID= $_POST['status']; // cashmaal Transaction Id
$web_id= $_POST['web_id']; // cashmaal website Id
$Amount= $_POST['Amount']; // Received Amount 
$currency= $_POST['currency']; // Transaction currency
$fee= $_POST['fee']; // Transaction Fee
$client_email= $_POST['client_email']; // client_email Id
$order_id= $_POST['order_id']; // order Id
$date_time= $_POST['date_time']; // Transaction DateTime
$addi_info= $_POST['addi_info']; // Received Amount 
$currency= $_POST['currency']; // Additional information 


/*
IMPORTANT: After update data in your database please show us body response '**OK**' (OK in between double stars). 

like you use command like exit('**OK**'); 

if you will show us body response, our system will resend callbacks until not get this response, If you will not show that then system will try once only.
*/




exit('**OK**');

}elseif($_POST['status'] == 2){
echo "Pending! Your payment is in pending in cashmaal account. ";
}else{
echo "Error! Payment not received. Please pay again.";
}




}else{
echo "Error! Data Invalid";
}

?>
//---------------------- PHP sample for IPN END