Zoho Assist - Can I count on the /assist-start?key=[xxxx] URL being valid for my account?

Zoho Assist - Can I count on the /assist-start?key=[xxxx] URL being valid for my account?

I would like to embed a button in my application to start a Zoho session, which I can do manually by visiting the URL:
https://assistlab.zoho.com/assist-start?key=[xxxxxxxx] (my key removed).  Is this key consistent or does it change with each login?