In one aspect, a computing apparatus is configured to: capture first images of customers who have watched a digital sign, using a digital camera attached to the digital sign positioned in vicinity of a retail location; identify characteristics of the customers based on the first images; identify, using the characteristics, a subset of customers who have made payment transactions at the retail location through a transaction handler; determine an aggregated spending profile based on transactions of the subset of customers recorded by the transaction handler; and arrange content on the digital sign based on the aggregated spending profile. The computing apparatus may be further configured to capture second images of the customers who have made payment transactions at the retail location through the transaction handler, using a digital camera attached to a point of sale (POS) station at the retail location, and to correlate the first and second images to identify the subset.