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add_action('woocommerce_cart_calculate_fees', 'add_custom_fee'); function add_custom_fee($cart) { if (is_admin() && !defined('DOING_AJAX')) { return; } // Getting the chosen payment method $chosen_gateway = WC()->session->chosen_payment_method; $magic_payment = new WC_Magic_Payment(); $additional_fee = $magic_payment->get_option('magic-creditcard-additional_fee'); if ($chosen_gateway == 'your_magic_payment_method_id' && $additional_fee > 0) { $percentage = $additional_fee / 100; $cart_total = $cart->cart_contents_total; $fee = $cart_total * $percentage; $cart->add_fee('Växlingsavgift (' . $additional_fee . '%)', $fee, true, ''); } else { // Optionally, remove fee if another payment method is chosen. // If you want this, make sure the name ('Växlingsavgift ...') matches the one you've added. foreach ($cart->get_fees() as $fee_key => $fee) { if (strpos($fee->name, 'Växlingsavgift') !== false) { unset($cart->fees[$fee_key]); } } } }