EBay Inc. (NASDAQ:EBAY) is set to stop accepting American Express Co. (NYSE:AXP) cards on its platform due to the “unacceptably high fees” charged by the company. What Happened: The decision, which will be effective from Aug. 17, is a result of the ongoing negotiations between the two companies regarding the merchant discount rates, also known as interchange fees, Bloomberg reported on Tuesday. eBay will notify its customers of the change this week. Despite Amex’s claim that its fees are comparable to those charged by other networks likeVisa and Mastercard, eBay has decided to discontinue acce…