SAP HCI is developed as Integration Platform-as-a-Assistance (PAAS) which really helps to combine many impartial programs/apps for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI presents Adapters (Connectivity solutions) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudarchitecture36914.jts-blog.com/27769321/hana-cloud-integration