Try this:
/includes/modules/payment/paypalwpp.php
around line 1583 you'll see this code:
Code:
// init new order object
require(DIR_WS_CLASSES . 'order.php');
$order = new order;
$doPayPal = $this->paypal_init();
Insert the extra lines as shown:
Code:
// init new order object
require(DIR_WS_CLASSES . 'order.php');
$order = new order;
require(DIR_WS_CLASSES . 'order_total.php');
$order_total_modules = new order_total;
$order_totals = $order_total_modules->pre_confirmation_check();
$order_totals = $order_total_modules->process();
$doPayPal = $this->paypal_init();
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