Trust relationships enable you to establish secure connections between known servers whose identity can be confirmed by a signed certificate. For integrating SAP S/4HANA Cloud and SAP Commerce Cloud, you’ll set up the trust relationships between SAP S/4HANA Cloud and Cloud Integration, and trust relationships between Cloud Integration and SAP Commerce Cloud. That means you need to download the certificate of the Cloud Integration tenant via a web browser and import it to SAP S/4HANA Cloud. Once the Cloud Integration certificate is installed on SAP S/4HANA Cloud, the SAP S/4HANA Cloud server can identify and trust the Cloud Integration server and allow it to securely connect to SAP S/4HANA Cloud. The same is applies for Cloud Integration and SAP Commerce Cloud.