SAP HCI is created as Integration System-as-a-Services (PAAS) which helps you to integrate a number of impartial devices/applications for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI delivers Adapters (Connectivity solutions) such as: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://s4-hana-cloud-onboarding36802.laowaiblog.com/27743120/hana-cloud-integration