What service can be used if the project has outgoing transactions and acts as an intermediary?

Question

Payment systems

We are designing a service that can both sell certain subscriptions and act as a marketplace and similar to an auction for other users.
What services allow such transactions to be carried out without legal difficulties and with a normal commission?
In addition, is there a similar one for foreign payments?

Answer 1

For subscriptions - Zuora, for the marketplace - it depends on what is sold and how. There are different tools

What services allow such transactions to be carried out without legal difficulties and with a normal commission

none

Answer 2

This one should fit.