For global B2C transfers, what banking details are needed to send winnings from a European gaming bank to users in 190+ countries?

It would be a very difficult effort for you to go into 190+ countries and establish banking connect presence there.

Your best option is to use services like Skrill, Payoneer, Earthport, Tipalti, et. al.

They all can easily assist you in this. Skrill specializes in gambling payouts, so this is right up their alley.