Zoho Service Communication (ZSC) Key
Zoho provides numerous world class apps in addition to Zoho Books, such as Zoho CRM, Zoho Invoice, etc. If you have a Zoho CRM account and would like to integrate with your Zoho Books or Zoho Invoice account, you may use this ZSC key to do so. The ZSC Key is a unique key used to communicate between these apps.
Go to Zoho Service Communication key in Settings, to get the key or to generate a new one.
Click on the Regenerate ZSC Key link provided on this page, to generate a new ZSC key.