How to put the payment module from megakassa on modx?

Question

MODX

Who put the payment module from megakassa on modx?
There is an instruction there, it is necessary to have a shopkeeper 3. I figured it out a
little, put the shopkeeper, but from the payment button it redirects to "moy-zakazi", but there is no such page (and is not planned).
In the settings of the mega cash desk, there are other addresses of accepted and rejected payments.