Access query string from incoming webhook URL in Zoho Flow

Access query string from incoming webhook URL in Zoho Flow

I have a fairly straightforward use case, but cannot find anything conclusive on this subject. How can I simply access the query string of the incoming webhook request in Zoho Flow?

I am attaching the Deal ID to the end of the request like:
https://flow.zoho.com/762439902/flow/webhook/incoming?zapikey=1001.0dec2d7dd15080c464a13925275f0129.448c23ee219c545c89f5a178456cfc8b&isdebug=false&dealID=${Deals.Deal Id}

My API sends data to Zoho Flow with the dynamic Deal ID in the query string. How do I access this ID to then pass along to update the deal in my flow as the Entry ID? I can only see how to access ${webhookTrigger.payload} not the actual request information beyond the headers, which you can select in Advanced Settings when you create the webhook.