Custom Payment Gateway Integration

Question

I have created an Application Form using Chronoforms V5. I need to integrate payment gateway when this form is submitted.

I have downloaded the integration kit for the gateway provider. It has php file for the form and 2 php files for success and failure redirection.

In the form's php, they are setting certain variables that are present as hidden fields in the form. I have created these fields in the form.

My query is where to place the php code to set these variables?

Next, on submit the form has to redirect to the gateway url, with the required variables posted. How to go about doing this?
I have also changed the form method to "Post". But on submit the form is not going to payment gateway.

This is the code they have added before the form.

<?php
// Merchant key here as provided by Payu
$MERCHANT_KEY = "JBZaLc";

// Merchant Salt as provided by Payu
$SALT = "GQs7yium";

// End point - change to https://secure.payu.in for LIVE mode
$PAYU_BASE_URL = "https://test.payu.in";

$action = '';

$posted = array();
if(!empty($_POST)) {
    //print_r($_POST);
  foreach($_POST as $key => $value) {    
    $posted[$key] = $value; 
	
  }
}

$formError = 0;

if(empty($posted['txnid'])) {
  // Generate random transaction id
  $txnid = substr(hash('sha256', mt_rand() . microtime()), 0, 20);
} else {
  $txnid = $posted['txnid'];
}
$hash = '';
// Hash Sequence
$hashSequence = "key|txnid|amount|productinfo|firstname|email|udf1|udf2|udf3|udf4|udf5|udf6|udf7|udf8|udf9|udf10";
if(empty($posted['hash']) && sizeof($posted) > 0) {
  if(
          empty($posted['key'])
          || empty($posted['txnid'])
          || empty($posted['amount'])
          || empty($posted['firstname'])
          || empty($posted['email'])
          || empty($posted['phone'])
          || empty($posted['productinfo'])
          || empty($posted['surl'])
          || empty($posted['furl'])
		  || empty($posted['service_provider'])
  ) {
    $formError = 1;
  } else {
    //$posted['productinfo'] = json_encode(json_decode('[{"name":"tutionfee","description":"","value":"500","isRequired":"false"},{"name":"developmentfee","description":"monthly tution fee","value":"1500","isRequired":"false"}]'));
	$hashVarsSeq = explode('|', $hashSequence);
    $hash_string = '';	
	foreach($hashVarsSeq as $hash_var) {
      $hash_string .= isset($posted[$hash_var]) ? $posted[$hash_var] : '';
      $hash_string .= '|';
    }

    $hash_string .= $SALT;


    $hash = strtolower(hash('sha512', $hash_string));
    $action = $PAYU_BASE_URL . '/_payment';
  }
} elseif(!empty($posted['hash'])) {
  $hash = $posted['hash'];
  $action = $PAYU_BASE_URL . '/_payment';
}
?>

They are loading the form using the following js and using in it during the body onload event.

<head>
  <script>
    var hash = '<?php echo $hash ?>';
    function submitPayuForm() {
      if(hash == '') {
        return;
      }
      var payuForm = document.forms.payuForm;
      payuForm.submit();
    }
  </script>
  </head>
  <body onload="submitPayuForm()">

How to replicate the same using Chornoforms? I would prefer if the Form structure and design to be in Chronoforms itself and not create a html form. I have used Chronoforms to create forms and not done any coding for forms using HTML.

Can u tell me how this can be done?

Regards,
Anu

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Custom Payment Gateway Integration