Ok the last time you reported in, you stated that the callbackPW was not appearing in your emails. Now are you saying that it appears but only if it is lower case ?
If this is the case, then you need to go over your steps again, as to how you saved things in worldpay, because there is no changing of case in "the worldpay module", it would all be over at worldpay's ends.
It may be that while changing you password around, you've saved something in a different way (copy to production environment manybe ?) because previously there have been reports of WorldPay behaving oddly in setting values for the test side of things, and it's quite important that we be able to distinguish between "your world pay bug" and bugs that are in the ZC module.
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