SAP HCI is built as Integration Platform-as-a-Company (PAAS) which helps you to combine multiple impartial devices/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) like: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudportal14691.thekatyblog.com/27537174/hana-cloud-integration