OK thanks.
So for the notification plugin, I understand that it displays a popup, but where does it display this popup? Because the partner restaurant (seller) will not have access to the site admin, only to his seller account in frontend.
For the commissions, (sorry for these questions but as I have not yet finished to configure my first multi-seller site I do not know yet how it works), in fact, the seller would not need to see the commissions / fee on the orders, because the admin of the site will make a manual calculation each month, and the rate of commissions will vary depending on the month.
So we could just not put any commission, so that if it shows up somewhere on the seller's account or invoice, he will see the full price. Then the admin will do the split?
Regards