http://articles.mercola.com/sites/articles/archive/2015/03/25/health-risks-bpa.aspx
Regardless of what you use to pay for your item, beware of the receipt. After reading the above article, I went to the local post office to mail a package. She handed me my receipt and I told her of the possible threat to her health handling all those receipts everyday. She informed me that the US Postal service had already changed their receipts.
BPA = Junk Science