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This paper proposes a cloud service model that centers around customer business requirements. The model covers the customers' subscribed services and the service providers' offered cloud services. It covers the relationship among offering versus subscription, cloud infrastructure service versus cloud application service, configuration versus customization of cloud services, etc. It then depicts a customer centric cloud service model which models the artifacts of enterprises owned by public serving cloud services. It's an extension of enterprise services to open service ecosystem leveraging the latest technical innovation of cloud computing. Later, this paper carries out a case study on an IBM software group ongoing project, commerce as a service, which aims to provide e-commerce functions as services over a cloud infrastructure.