SAP HCI is created as Integration Platform-as-a-Support (PAAS) which helps you to integrate several impartial techniques/programs for a business process. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI presents Adapters (Connectivity selections) for instance: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-faq35813.like-blogs.com/28017774/hana-cloud-integration