Associate SalesIQ visitor with lead created via REST API (PHP SDK)

Associate SalesIQ visitor with lead created via REST API (PHP SDK)

Hello,

I am working on a website that has SalesIQ embedded into it.

This site also has some custom forms.  Behind those form submissions, we are using the PHP SDK to create Leads in Zoho CRM.

This is all working, however the "Visit Summary" is not being populated.  I can find myself in the SalesIQ panel as a visitor, but obviously there is nothing that is making the connection between the lead that I am creating with the API and the visitor in SalesIQ.

I am noticing that there are a couple of cookies set:
***-_zldt
***-_zldp

Those appear to be related to SalesIQ according to:
https://www.zoho.com/salesiq/cookies-policy.html

So, my question is:

How do I pass that cookie data along with the request to create a Lead that will associate the lead with that SalesIQ visitor data?

Thank you