Minimum FIRST TIME order fee

[adam2020]

It works like a charm. Thank you for your help Ajeh

If anyone is interested in Minimum Order for first order only, use the Minimum Order addon and substitute includes/classes/observers/class.minimum_order_amount.php with the code below:

<?php
/**
 * class.minimum_order_amount.php
 *
 * @copyright Copyright 2005-2007 Andrew Berezin eCommerce-Service.com
 * @copyright Portions Copyright 2003-2006 Zen Cart Development Team
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: config.minimum_order_amount.php 1.0.1 20.09.2007 0:06 AndrewBerezin $
 */

/**
 * Observer class used to check minimum order amount
 *
 */
class minimum_order_amount extends base {
  /**
   * constructor method
   *
   * Attaches our class to the ... and watches for 4 notifier events.
   */
  function minimum_order_amount() {
    global $zco_notifier;
//      $_SESSION['cart']->attach($this, array('NOTIFIER_CART_GET_PRODUCTS_START', 'NOTIFIER_CART_GET_PRODUCTS_END'));
    $zco_notifier->attach($this, array('NOTIFY_HEADER_END_SHOPPING_CART', 'NOTIFY_HEADER_START_CHECKOUT_SHIPPING', 'NOTIFY_HEADER_START_CHECKOUT_PAYMENT', 'NOTIFY_HEADER_START_CHECKOUT_CONFIRMATION'));
  }
  /**
   * Update Method
   *
   * Called by observed class when any of our notifiable events occur
   *
   * @param object $class
   * @param string $eventID
   */
  function update(&$class, $eventID) {
    global $messageStack;
    global $currencies;
    switch ($eventID) {
      case 'NOTIFIER_CART_GET_PRODUCTS_END':
      case 'NOTIFY_HEADER_END_SHOPPING_CART':
        if ($_SESSION['cart']->count_contents() > 0 && MIN_ORDER_AMOUNT > 0) {
		
		// check for at least 1 existing order 
			global $db;
			$sql = "SELECT orders_id from " . TABLE_ORDERS . " WHERE customers_id = '" . $_SESSION['customer_id'] . "' limit 1";
			$chk_customers_orders = $db->Execute($sql);
			if (!$chk_customers_orders->fields['orders_id'] > 0) {
				$charge_minimum = true;
			} else {
  $charge_minimum = false;
			}
          if($charge_minimum && $_SESSION['cart']->show_total() < MIN_ORDER_AMOUNT) {
            $_SESSION['valid_to_checkout'] = false;
            $messageStack->add('shopping_cart', sprintf(TEXT_ORDER_UNDER_MIN_AMOUNT, $currencies->format(MIN_ORDER_AMOUNT)) . '<br />', 'caution');
          }
        }
        break;
      case 'NOTIFY_HEADER_START_CHECKOUT_SHIPPING':
      case 'NOTIFY_HEADER_START_CHECKOUT_PAYMENT':
      case 'NOTIFY_HEADER_START_CHECKOUT_CONFIRMATION':
        if ($_SESSION['cart']->count_contents() > 0 && MIN_ORDER_AMOUNT > 0) {
          if($_SESSION['cart']->show_total() < MIN_ORDER_AMOUNT) {
            zen_redirect(zen_href_link(FILENAME_SHOPPING_CART));
          }
        }
        break;
      default:
        break;
    }
  }
}
?>

Also edit the language files to something more suitable for First Order.