Here's how to prefill the Customer ID and Customer Email hidden fields in jotform when the iframe is added to the liquid code. On the Wholesale landing page, it's not needed, but those fields will be needed for the "Restock" form.
If this customer is logged in, these fields should automatically be included anywhere this iframe is used.
id="JotFormIFrame-242645425864362"
title="Master Calculator - (Qty, Unit Price, Resale Price, Cost, Rev, Profit, Multi-Option Checkout)"
onDISABLEDload="window.parent.scrollTo(0,0)"
allowtransparency="true"
allow="geolocation; microphone; camera; fullscreen"
src="https://form.jotform.com/242645425864362?customerId={{ customer.id }}&customerEmail={{ customer.email }}"
frameborder="0"
style="min-width:100%;max-width:100%;height:539px;border:none;"
scrolling="no"
>