SAP HCI is designed as Integration System-as-a-Support (PAAS) which helps you to combine multiple independent techniques/apps for a company system. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI offers Adapters (Connectivity alternatives) for example: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://tysongeaxt.aboutyoublog.com/28869282/hana-cloud-integration