Baba the story confuse me. You mean say scammers or hackers fit access POS though receipts? If this one na true na him bi say them go don hack almost all the PoS for Naija. Receipt na wetin almost all POS operators dey issue to almost all customers.
I believe say your friend no talk the story well. Maybe the guy man see the password or him press something for the machine. Anyway, we need to dey careful because scammers no dey sleep, them dey bring no pattern almost everyday.
Na the first time wey me too go hear this kind of story about scammers, but nothing wey scammers no fit do just to make sure say them succeed in scamming people, even POS no safe for this country, although them dey scam POS even before but this one wey person just come buy airtime and them give am receipt and later things Dey sup Dey very surprise, POS must give customers receipt for evidence and proof for letting them know that they withdraw from their place and the amount wey them withdraw in case something come later sup.
That person wey Dey do POS should reason waiting cause that thing wey Dey make him Dey receive debit alert from him account, some POS people too Dey lose guard sometimes because I know some POS people wey sabi some dirty work if people come withdraw from them and later the thing Dey affect them, I no accuse anybody oh, I just Dey talk base on my own experience and waiting I don see with some POS people.