'ECommerce_Checkout', 'itemName' => 'Order', 'itemsName' => 'Orders', //allowed payment methods 'payment' => array( 'PayPalExpressCheckout' => 'PayPal Express', ), // list of payment processors that needs service product if cart item subtotal == 0 and shipping exists 'serviceProductPayments' => ['PayPalExpressCheckout', 'PayPalStandard'], 'currency' => 'USD', );