SAP HCI is built as Integration Platform-as-a-Assistance (PAAS) which really helps to combine a number of impartial techniques/programs for a business process. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI delivers Adapters (Connectivity alternatives) including: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-business-pa47025.liberty-blog.com/28257395/hana-cloud-integration