SAP HCI is developed as Integration Platform-as-a-Services (PAAS) which helps you to combine multiple impartial devices/applications for a business approach. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI features Adapters (Connectivity alternatives) for instance: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-onboarding35701.madmouseblog.com/8694646/hana-cloud-integration