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I have to say I don't know what callback is and I couldn't find it on their site. I did a search for worldpay callback on google and found a few examples. Do they not have documentation that you can read through to understand it better?
I have just completed a WorldPay callback for our installation.
Basically, you need to log into WorlPay's CMS, and edit your installation's configuration. There you can specify to use a callback by checking callback enabled, and you can enter the callback's full URL.
When your callback is called, the POST variables will contain various variables such as the world pay transaction ID and whether the transaction was successfull or cancelled.
You could also block particular addresses (physical or email), phone numbers as so on...
This may help cut down on fraud attempts.