That seems to be a running issue that is discussed in the
WorldPay Version 3.0 thread with some included
discussion/correction by niccol.
Long and short of it, although there was an equivalent system problem as was reported related to ZC core code, this issue is related to a plugin and its integration with ZC and not specifically ZC. It is unfortunate that countrycharm is no longer available to support further upgrade, but well, that's how life goes.
Recommendation would be to carry the discussion and problem resolution(s) further in that module's thread so that others using WorldPay may further help or also gain from the corrections.
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