This call is a scam.  I work at a convenience store and a man called in saying that they needed to run a  test on their equipment.  Mind you I work the graveyard shift so no managers were available.  When I told the caller that they would need to speak to a manager they said the manager knew about, etc.  I told them until a manager made me aware that someone might be calling and said that it was ok to run this test I wasn't going to do it.  He tried to intimidate me saying that if I didn't run this test there would be a $1,500 and we would also be charged a fee when the tech came out.  Also if I didn't run this test they would pull all of their product out of the store.  I told him again that I was not running the test and ended the call.  Afterwards I called my manager at home and she confirmed that yes it was a scam and that know one would be calling at 1 a.m. in the morning to run a test.  They run this scan so they can get you to do what they need to gain access to your Verifone machine and get money out of it.