This Guidance demonstrates how retailers can set up a point of sale (POS) system in the AWS Cloud. Data captured by in-store card readers and POS terminals is securely transmitted to backend applications for processing and settlement. Key business processes such as checkout, order processing, inventory management, and back office functions are all integrated from the corporate data center to the Cloud. The security and confidentiality of the captured data is ensured through monitoring, security, and protection measures.
https://aws.amazon.com/solutions/guidance/traditional-pos-checkout-on-aws/?did=sl_card&trk=sl_card