SAP HCI is created as Integration Platform-as-a-Support (PAAS) which helps you to integrate numerous independent systems/purposes for a company course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI provides Adapters (Connectivity choices) like: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://s4-hana-cloud-faq48235.thechapblog.com/27760432/hana-cloud-integration