Himalayan Bank Payment Gateway

hbl.php

<?php
/**
 *
 * Himalayan Bank Payment Gateway
 * Prod endpoint : https://hblpgw.2c2p.com/HBLPGW/Payment/Payment/Payment
 * Dev endpoint  : https://hbl.pgw/payment
 *
 * HTTP status code :
 *
 * 00 Approved ,transaction is successfully paid.
 * 03 Invalid merchant id
 * 524 currency code for Nepalese currency
 * 840 currency code for United States dollar
 *
 * @version 1.0
 *
 */
?>

<form method="post" action="https://hblpgw.2c2p.com/HBLPGW/Payment/Payment/Payment">
    <input type="text" id="paymentGatewayID" name="paymentGatewayID" value="Ex: MechantId"/>
    <input type="text" id="invoiceNo" name="invoiceNo" value="00000001234567890333"/>
    <input type="text" id="productDesc" name="productDesc" value="Test Product"/>
    <input type="text" id="amount" name="amount" value="000000010000"/>
    <input type="text" id="currencyCode" name="currencyCode" value="Ex: 524"/>
    <input type="text" id="userDefined1" name="userDefined1" value="custom data"/>
    <input type="text" id="nonSecure" name="nonSecure" value="Y"/>
    <input type="text" id="hashValue" name="hashValue" value="94E8E91C29E73B9648011FADBAE19849B520B24B"/>
</form>

<?php 
/**
 *
 * Hashing function
 *
 * Hash value is computed using HMACSHA256 algorithm with merchant secret key
 * (provided by HBL to merchant).
 *
 * HashValue = merchantID + invoiceNumber + amount + currencyCode + nonSecure
 *
 * @version 1.0
 *
 */

$signData = hash_hmac('SHA256', "signatureString",'SecretKey', false);
$signData = strtoupper($signData);
echo urlencode($signData);
 
?>

@riwash g in which programming are you trying to implement this?