Hi Team, I am planning to start a marketplace website that will allow sellers from overseas and from the local Australian market to post their items on our website. When some of them will sell an item, I will receive the money and will deduct a small percentage as a service fee and the rest will be transferred to the seller, and the seller will post the item directly to the buyer.
I am providing services for having their items on my website, advertising (marketing) the items, receiving money and helping customers with refunds (if any). My question is, am I will be liable for the GST only on the service fee that I kept or for the total sales price?