While most brands are seeking alternative identity solutions as a replacement for third-party cookies, others are further along the road to achieving first-party data capabilities. Take the northeastern U.S. grocery chain Stop & Shop, which is now four years into an ecommerce-focused program with a test-and-learn strategy that’s yielding promising results. Here are some of the lessons learned from Stop & Shop’s early-adopter approach, according to a piece in AdExchanger.