SAP HCI is made as Integration Platform-as-a-Provider (PAAS) which really helps to combine a number of impartial devices/apps for a business approach. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI offers Adapters (Connectivity choices) like: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://kylerjheax.ageeksblog.com/27631777/hana-cloud-integration