At the minute I have a JSP page that sends info to Worldpay by sending a form with all the relevent info.
Can I just send this info through a normal HTML page?
Yes,
you can just send the info in a HTTP Post.
This is sent to a Secure (SSL) Session on Worldpay's servers.
They then, once processed, call a page your specify back, with the Relevant Post Purchase info.
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