SAP HCI is built as Integration Platform-as-a-Provider (PAAS) which really helps to combine multiple independent techniques/programs for a business approach. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI gives Adapters (Connectivity selections) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudtrial80246.creacionblog.com/28029029/hana-cloud-integration