SAP HCI is made as Integration System-as-a-Provider (PAAS) which really helps to integrate several impartial units/applications for a company 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 example: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-portal58034.techionblog.com/28195145/hana-cloud-integration