C4C SDK How to get sap-client number in ABSL

Hi Experts,

How can I get sap-client number using ABSL code?

I'm looking for a system variable like sy-mandt in ABAP.

https://myXXXXXX.crm.ondemand.com/sap/public/ap/ui/repository/SAP_BYD_UI/Runtime/StartPage.html?sap-client=XXX&sap-system-login-basic_auth=X&sap-language=EN

Best Regards,

Mateusz