1. I am trying to integrate Zoho Desk Help Center portal with my website. When users in my website login and click the button associated with Zoho Help Center portal, they will be able to access my help center portal to manage their tickets like raising a ticket, replying to a ticket etc.

2.To achieve integrating help center portal, I followed setting steps specified in the document which is in this link(https://help.zoho.com/portal/en/kb/desk/for-administrators/user-access-and-security/articles/setting-up-saml-single-signon-for-help-center#How_SAML_Works).  

3. I want to use Zoho Vault as IdP and I configured settings and Zoho Desk Help Center Portal settings according to your document which I mention about it above.

4.I attached a photo which I explain SAML work flow and I ask some question in it. To sum up, How can I make request from my web site to Zoho Help Center Portal without any authentication credentials. Please inspect the photo to be attached and give answers of my questions? Thanks have nice days.