SAP HCI is created as Integration System-as-a-Provider (PAAS) which really helps to integrate a number of independent techniques/purposes for a business process. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI features Adapters (Connectivity selections) including: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-trial24691.mybjjblog.com/hana-cloud-integration-41670902