Please tell me about Robokassa

Question

Payment systems

There was a question about connecting the robokassa to my online store.
Nothing is clear from their official website, their support also speaks in vague phrases.
Help to understand please who had experience with this system.

Their TA says that they do not charge any commission from the online store, but take money from customers:

I asked them about individuals:

With this form of cooperation, no commissions will be taken from you.
All overhead costs are paid by your buyers. It is impossible to simply write down the amount of the commission that will be charged to the buyer. Since it is calculated each time, with each payment transaction, individually.
But, you can use this software interface: “Interface for receiving exchange rates and calculating the amount for payment” www.robokassa.ru/ru/Doc/Ru/Interface.aspx#233
With it, you can calculate the amount of the commission each time in advance.

Does anyone know how they calculate the commission that is charged to the buyer?

And how to withdraw money from there? Do they charge a percentage for it? How about on a map?

Answer 1

Connected as IP. Interest is deducted from me (for the convenience of the client). Poor control panel. You can not connect multiple stores to 1 account. Several accounts can be linked to one IP by an additional agreement, but the reports will be separate for each account.
Additionally, I want to connect QIWI (http://ishopnew.qiwi.ru/reg.html).
In Russia, they mostly pay with the usual payment for the bank.