SAP HCI is built as Integration System-as-a-Assistance (PAAS) which really helps to combine a number of impartial programs/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 possibilities) for example: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://s4-hana-cloud-edition81367.boyblogguide.com/27698595/hana-cloud-integration