Extension is simple ,just drop in the respective folders and you are done.
Made by shambhal who holds maximum opencart reviews on freelancer.com.
It works well with opencart default structure , and should be compatible with other checkout extensions , yet working with custom checkout extensions has not checked.Compatibility with custom checkout extensions could be fixed with extra payment( chances are rare).
Since it works with euro cent , it is assumed you have currency with code EUR in your opencart
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