PayPal will have a mobile payment trial up-and-running with a major US retailer before the year-end, according to parent eBay’s chief executive John Donahoe speaking during an analyst call for the e-commerce site’s Q2 2011 results. After this year’s trial there will be a significant ramp-up in 2012 with a consequent growth in revenue, he said: “We will have active operations in multiple merchants next year and I think.”