How to configure WorldPay for your site
First, login to the WorldPay Account Manager via the link provided to you by WorldPay (Typically: https://support.worldpay.com/admin)
1. Select the 'Configure Options' link item at the bottom-right.
2. Select the 'Payflow Link Info' option.
3. Set the 'Callback URL' to equal:
  http://www.your_website_url.com/shopping/pgm-silent_post.php
4. Check the 'Callback enabled' box.
Your WorldPay system is now configured!
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