Development of software for payment terminals, what to read?

Question

Payment terminals

Good afternoon, tell me where you can get information on the topic of software development for payment terminals. Perhaps someone has experience with such a development, it was interesting to hear their comments.

Answer 1

As a rule, two loosely connected parts are made. Interface and core of the system.
With your case business probably is so: the service (daemon) is started and opens http port. The flash opens in full screen in the browser and communicates with the core via the http protocol. This is how quickpay.ru's terminal software is made. Osmp.ru has
a different approach : they embed a browser in their software, the interface is a set of html / js pages. Communication with the core occurs through setting values ​​in hidden input tags. Cyberplat has an open source terminal software in c++/qt, you can see dev.cyberplat.com/redmine/wiki/pt. It supports most of the required hardware.

Answer 2

First of all, documentation for the EMV card reader and EPP-EDM keyboard (if payment is made by cards). Documentation to the bill acceptor if money. Next, a long conversation with the processing center of the bank, in order to obtain the API. And, of course, a thermal printer.
It is difficult to say in more detail, without knowing what kind of hardware you have and what kind of processing center.

Answer 3

Qt. Ease of development, plus you can make custom styles for widgets (in css).