SAP HCI is built as Integration Platform-as-a-Service (PAAS) which helps you to combine multiple impartial units/applications for a business course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI gives Adapters (Connectivity solutions) including: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudtutorial14680.aboutyoublog.com/28976721/hana-cloud-integration