Is it possible to test the connection of a payment system without registering a store in this system?

Question

Payment systems

I see Yandex has a test server. But in the docks they write 'For testing, you need to get the parameters of your store from the manager'. I looked in the direction of Platon.ua - everything is fine, but again there is a problem, there is no test environment. But after all modules as the same are written?