Payment aggregators, how do they work?

Question

Payment systems

I began to study this area and I can’t clarify for myself how the aggregators are arranged inside.
1) Can I conclude contracts with several aggregators? Will the termination of the contract with one of the aggregators affect the relationship with another aggregator (diversification, so to speak)
2) Do I understand correctly that the aggregator enters into agreements with payments between themselves and them and the payments do not know anything about me in the process of working with the aggregator.
3) When a user pays through an aggregator, the funds go to the aggregator, and then he transfers them to me?
Thanks in advance for your replies

Answer 1

1. Yes, you can. No problems will arise (if one is lying, payment will go through the other, or additional payment methods, as an option)
2. Yes, absolutely right. True, in some cases, payment orders require the fulfillment of any conditions (for example, WebMoney will require you to add a site to your catalog)
3. Yes, the aggregator has the funds. Usually withdrawn either on certain days of the month, or at the end of the settlement day