SAP HCI is built as Integration System-as-a-Provider (PAAS) which really helps to integrate several impartial systems/programs for a business course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI provides Adapters (Connectivity possibilities) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, https://s4-hana-cloud-onboarding36802.liberty-blog.com/28252748/hana-cloud-integration