Similarly to what happens with PayPal Payments Standard, when you select WorldPay as your payment gateway, customers will temporarily leave your Web site to submit their payment information.

When customers click on the Continue button after verifying the correctness of the order on your store, they will temporarily leave your Web site and will be taken to a secure payment form located on the WorldPay Web site (see image below). The billing address is passed to the payment gateway by ProductCart, so the customer won’t have to re-enter it. Once the transaction is processed, customers will be redirected back to your store.

To process the payment, customers will enter their credit card information and then click on the Make Payment button. The transaction will be processed and a message will be returned to them. If the transaction is processed successfully, they will see a payment confirmation page. Once on this page, customers MUST CLICK ON 'COMPLETE MY ORDER' to complete their order.

A message on that page will remind them of this (the screen shot shown below was taken from a test transaction – the message will be similar during a live transaction).

When customers click on the Complete My Order link, they will be taken back to your store and their order status will be updated. If they don’t click on the Complete My Order link, no information is sent back to your store, which means that there is no way for ProductCart to know that payment for the order was collected successfully. In that scenario, the order is treated as if it did not go through and therefore will not show up in the order reports. No order confirmation e-mails will be sent by ProductCart, but you should still receive a confirmation e-mail directly from WorldPay. If this occurs, you now know the reason: the customer likely forgot to complete the order. 310

To configure WorldPay as your payment gateway, you will need to log into the WorldPay Administration Server located at https://select.worldpay.com/wcc/admin. Then, at the bottom-right corner of the page, select “Configuration Options”. Follow the instructions below to properly configure the system. Note the following entries:

• Description: Enter any value here (e.g. Store order).
• Customer Description: Same as above.
• Payment Response URL: http://www.yourStore.com/ProductCart/pc/wp_insert.asp
• Payment Response enabled: checked
• Enable the Shopper Response: checked
• Suspension of Payment Response: checked
• All others remain unchecked Save the configuration options, then go back to your ProductCart Control Panel to complete the configuration:

• Check the Enable WorldPay option.
• Enter the Installation ID that was provided to you when you setup your WorldPay account.
• Select your store’s default currency. One nice feature about WorldPay is that customers will actually be able to change the currency the order will be processed in once they get to the payment details page. For example, a European customer shopping on an American online store could change the currency from US $ to Euro on the payment details page, using the Choose Currency drop-down menu. The order total is automatically converted in all the currencies supported by the system.
• Enable Test Mode: You can set WorldPay to run in Test Mode. When you do, all transactions will be approved and the credit card will not be charged.
• Processing Fee: You can choose whether to charge an additional transaction fee using the Processing Fee field. The fee can be either a flat charge or a percentage of the total order amount.
• Payment Name: You can change the description that is shown to your customers during checkout. For example, you could change “Credit Card” to “Visa and MasterCard”. To complete the activation, submit the form by clicking the Add button.