Evgeny, good evening.
I see the developers do not answer, most likely it is because the integration itself works, the question is only about the system to which you want to upload data.
Accordingly, if you want to thoroughly solve the problem, you should find out in which data center your box is located, rent a WordPress server there with the necessary parameters and transfer your site there. As a result, the Internet will not be used for local data exchange.
If for some reason it is not suitable - you can contact the integrators for help
https://1b.app/ua/partner/search/?tags[]=3