Hi there, Probably the best in-depth book on this topic I've read is this one. I'd highly recommend it. http://www.amazon.co.uk/Payment-Systems-Macmillan-Fina

Hi there, Probably the best in-depth book on this topic I've read is this one. I'd highly recommend it. http://www.amazon.co.uk/Payment-Systems-Macmillan-Financial-Institutions/dp/0230202500/ref=sr_1_1?s=books&ie=UTF8&qid=1385413897&sr=1-1 http://www.amazon.co.uk/Payment-Systems-Macmillan-Financial-... (Disclosure: it was co-written by one of my colleagues at IBM)