HI @Gennadiy Bezkorovayniy
The sandbox is still work in progress, however we provide our S+ integrators today with WebexCC instances that can be used for development.
Are you a Cisco certified partner or S+ integrator? or looking to just try out these APIs?
If you are interested in building a specific solution, please 1-1 on community and I can share those details.
Thanks & Regards,
Arunabh.