As a CSP, I want to know how our customers can access their own failovers.
In the below link you will find the ZSSP Online Help documentation. This zip file contains a number of documents explaining how to use the ZSSP, the Zerto Self-Service Portal. This is the web application that Cloud Service Provider customers can use to manage their ZORG. The document 1_AccessZSSP.doc will explain how your customer can connect to the ZSSP, and further documents can explain how to perform the various tasks they may wish to accomplish.
ZSSP Documentation: https://www.zerto.com/myzerto/zr_td/zssp-online-help-zerto-virtual-replication-6_5-2/