I want to try using contactless payment in the establishment. But I have to monitor how much I need to invest in order to switch to a new payment method. Who did the replacement of the payment method, where did they turn?

You should turn to specialists who help to introduce innovative technologies into work. The company's specialists will install a special application Softpos https://m4bank.com/softpos on your Android smartphone. You can use it to accept payments from customers quickly. Customers are more satisfied with this payment system than with terminals. I think that this payment system is the future