Avoid duplicate orders

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In order to avoid duplicate orders, I recommend immediately deactivating the button for submitting the order after the first click and providing the customer with a message that their order is being processed as long as the "checkout_confirmation.php" page is not yet open was redirected.

Sometimes the processing takes a little longer and the customer clicks the button again to send the order and this is then carried out twice. For this reason, the following code is recommended.

Find in: catalog/checkout_confirmation.php

  require('includes/template_top.php');
?>

Add after:

<script type="text/javascript">
function SubmitOrderButton(){
        document.getElementById("submitmain").style.display = "none";    
    
    if (navigator.appName == "Microsoft Internet Explorer") {
    document.getElementById("pleasewait").innerHTML = "";
    document.getElementById("pleasewait").style.display = "block";
    document.getElementById("pleasewait").innerHTML = "<img src='images/pleasewait.gif' alt='Please Wait'>";
    } else {
    document.getElementById("pleasewait").style.display = "block";        
    }
}
</script>

Change this code:

      <?php
      if (is_array($payment_modules->modules)) {
        echo $payment_modules->process_button();
      }
      echo tep_draw_button(IMAGE_BUTTON_CONFIRM_ORDER, 'fa fa-ok', null, 'primary', null, 'btn-success');
      ?>

With:

<span id="submitmain">
<?php
if (is_array($payment_modules->modules)) {
echo $payment_modules->process_button();
}
?>
<br>
<?php echo tep_draw_button(IMAGE_BUTTON_CONFIRM_ORDER, 'fas fa-check-circle', null, 'primary', null, 'btn-success btn-block btn-lg');?>
</span>
<span id="pleasewait" style="display:none">

<span class="col-sm-12 w3-padding w3-round w3-table w3-border w3-bottombar w3-border-deep-orange w3-food-apricot w3-text-black w3-center w3-large">
<i class="w3-spin fab fa-cloudscale fa-2x"></i>&nbsp;<?php echo TEXT_PROCCESSING_ORDER;?></span>
</span>

Add in: catalog/includes/languages/english/checkout_confirmation.php

define('TEXT_PROCCESSING_ORDER', 'Order is being processed');

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