Abstract:In this study, a payment system has been tried to be designed by considering the advantages of
NFC. As is known, security in payment systems is of great importance. These are the dangers that attackers
can capture, change or use payment information for different purposes. It is of great importance to design
a system that will operate smoothly against these dangers. On the other hand, there are important advantages
of using an NFC-enabled mobile phone for payment transactions. For this reason, in this study, it has been
tried to perform a secure payment transaction through an application developed on a mobile phone. While
doing this we use an NFC portable and has version 4.4 or above Android phone, an NFC card, Firebase
database that presented by Google and tokenization. We can simply define tokenization as placing a random
string with your credit card number. First of all, we need to download the application to our phones. The
phone will act as a POS machine with this application. Users can use the phone as a POS and can make
transactions using it. In this system even if someone access to database only thing they will see going to be
a random string number that is useless. We can say that the system will meet the requirements in terms of
security and privacy. Keywords:NFC, POS, contactless, payment system, security and privacy
