The admin commission fee is a percentage of the value of every successful transaction (e.g. 10%) that happens on your online marketplace and credited to your account. The admin commission fees will be a percentage (can be 0%) of the total transaction value, and this percentage is determined by you, the marketplace admin.
Depending on the payment method used (Stripe or PayPal), there will be a transaction fee that will be charged on the seller or both the admin and the seller respectively.
Find out more about transaction fees here:
Alternatively, you can refer to the Payment Method section of the help centre.