Posted by Dean on April 2, 2017, 4:07 pm Make sure you clean the chip before inserting into machine (wipe on shirt.). Was told this by one of the managers and never have issues with card at banamex! 340 Message Thread Chipped cards at banamex - Dean April 2, 2017, 4:07 pm Re: Chipped cards at banamex - Tim Edwards April 2, 2017, 7:40 pm « Back to index | View thread »