dasonix,
There is no such file as 'wpcallback.html'
In your WorldPay account you should set the Callback URL to:
Code:
http://<wpdisplay item="MC_callback">
'MC_callback' is set by the WorldPay Module and passed to WorldPay so that WorldPay knows where to send the response. In this way several sites can use the same WorldPay account for payment processing. There is no need to set this to anything else.
I would suspect that SEO URLs is the problem - I have not tested the WorldPay module with this contribution. Perhaps you could try uninstalling this contribution. If that doesn't work it may be a problem with your server configuration.
Regards,
Alan
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