S4 eXchange can help retail stores integrate their eCommerce platforms with their point-of-sale systems, allowing them to offer various shopping options to their customers. eXchange provides integrations with various providers and automates order processing at the point of sale, saving time and reducing errors. It also offers functions for pricing, rounding, and excluding batches. The onboarding process involves a survey to understand the eCommerce implementations and the installation of modules and services. Customers can verify the process by ringing up a few online orders.