SAP HCI is built as Integration System-as-a-Company (PAAS) which really helps to combine many unbiased devices/apps for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI presents Adapters (Connectivity solutions) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://sap-s-4hana-cloud30528.jaiblogs.com/55110948/hana-cloud-integration