Building a POS interception device

We need to develop a device to intercept receipt data sent from point-of-sales (POS) system to receipt printer. This device must be able to work with most of the common receipt printer brands out there, intercept data and convert into readable format. The device must be able to intercept the print data stream, interprets the content, and turns it into a secure 1-time-use QR code that is added to bill footers (pos thermal printer).