Question: Does the seller needs to create an account in MangoPay or is it only the Admin who needs to create one?
The seller just needs to provide the bank details at the seller panel to transfer the amount to his bank account.
Question: How is the commission paid to the Admin? Is it automatically split?
Answer: Yes, the amount will be automatically split between the admin and the seller.
Question: Who pays the fees? The seller, the admin, or both?
Answer: The admin pays the fees. You can check the fee structure here.