I've been using the Worldpay contribution for a few months now, and it all seems to be working as it should. I would like to a slight adjustment though, and can't find the issue mentioned on the forum. My client has 3 accounts (6, including the associated test accounts) with worldpay, and I would like to get all osCommerce orders to consistently use the same account. When using static order pages (ie, not using osCommerce), this is done by adding the following to the WorldPay order form: <input type="hidden" name="accId1" value="123456"> So, will adding the following to worldpay.php have the same effect? tep_draw_hidden_field('accId1', 123456) . Cheers.