We're talking all things payments and retail in this week's episode of "On the Money," brought to you by PayPal, including the rise of the pop-up shop. The temporary stores are starting to get permanent homes in some of the country's biggest malls. America's largest mall operator, Simon Property Group, is set to unveil a space designated for pop-up stores next month. Plus, the e-commerce industry is poised for good times ahead. A new report shows online purchases account for 12% of total retail sales, and things might only get better from here. The National Retail Federation forecasts non-store sales will rise between 11% and 15% heading into the last two months of the year.