The client withdraw money but the cash don't appear, he should conclude to a malfunction (i don't really think this stuff is profitable, maybe i'm wrong)
No idea also if there is some sort of technology with models (the machine swallow cash if money is not full out after seconds)
http://translate.google.com/translate?hl=en&sl=gr&tl=en&u=http://www.protothema.gr/greece/article/?aid=109205
