<prompt> Human: Should I be worried, allegedly he got turned down for a line of credit but has a card with a high enough limit car is only 3k, I have a square reader so I can process his card, Im just wondering if I should or not.Edit: seems like my gut reaction was right. Ive told the guy I only want cash. Thanks for all your input  <response>: Yes, he can do a charge back. Also, you will have to pay fees to Square for processing the card. 