SAP HCI is made as Integration Platform-as-a-Support (PAAS) which helps you to combine multiple independent systems/applications for a company process. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI presents Adapters (Connectivity options) such as: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-portal58034.techionblog.com/28195145/hana-cloud-integration