I am implementing ATM Simulator, which accepts ISO8583 msg from client and unpack it using jPOS library. Error that has occured while unpacking my msg is : "error unpacking field 102: negativearray...

As the title says, I am trying to decrypt DUKPT encrypted track data coming from a DUKPT enabled scanner. I have the ANSI Standard (X9.24) for DUKPT and have successfully implemented the ability t...

I have a project in which I need to interact with POS - Terminal Devices and magnetic/chip cards. Let's say, whenever customer buy goods from my department store, staff from this store will stripe ...