ipay generate hash id
<?php
$datastring = "key1=".$value1."&key2=".$value2
/*************************************************************************************************/
$hashkey = "yoursecuritykey"; //Supplied during iPay account registration;
$datastring; //This is a string generated from the data to be posted (see above)
$hashid = hash_hmac("sha256", $datastring, $hashkey); //
?>