Platform as a service (PAAS) featuring computer software platform for managing e-commerce businesses, namely, software platform for customizing and managing e-commerce storefronts, tracking and managing the fulfillment and delivery of general consumer goods, creating and placing digital advertising, tracking and analyzing consumer and inventory data to optimize business operations, and connecting to and interfacing with in-store technologies, namely, scanless carts and self-service checkout stations; platform as a service (PAAS) featuring computer software platform for tracking and analyzing advertising impressions, spend, and statistics