Hello

If you want to control all payments and get commissions then you need to use Stripe for common sellers and Stripe Connect for you as site owner. You may read more about how Stripe Connect should be configured in UNA here.

Unfortunately, there is no way to disable the other payment providers via Studio. Currently it can be done via UNA database only. We'll add the feature in the next update https://github.com/unaio/una/issues/1670

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Best Regards
Anton