SAP HCI is developed as Integration System-as-a-Company (PAAS) which really helps to combine several independent methods/applications for a company course of action. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI features Adapters (Connectivity solutions) for instance: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://s4hanacloudlandscapeconsi93580.blogzet.com/hana-cloud-integration-42986894