I’m developing a market place for sellers and buyers. I’ve been messing around with PayPal Rest API. I just wanted to ask a question, how would I displays the sellers PayPal Fees in a summary before the buyer pays?.

If a buyer has agreed to let’s say pay for an item with postage for 15 pounds tottaly and then pays, then this amount would be incorrect as the seller PayPal fees would be charged on top and the buyer would not see this.