SAP HCI is made as Integration Platform-as-a-Services (PAAS) which really helps to integrate many independent devices/applications for a business procedure. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI gives Adapters (Connectivity options) for example: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://angelohdzuo.blogmazing.com/27848321/hana-cloud-integration