In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
If the company’s business is restricted to manufacturing the machines which are used only for collecting payments, then there is no harm that you work there and sell those machines.
Answering your question, the General Iftaa’ Department in Jordan, states the following:
This is because they are a means of collecting payments, have nothing to do with unlawful transactions, don’t provide assistance to that end and whatever commissions are received by the company is considered conditional payment.
Almighty Allah knows best.