Share links from the thank you page and the emails carry the buyer’s own referral code. Clicks are counted per day, and orders that came through a link are credited to the buyer who shared it, ignoring buyers who refer themselves.
When a deal unlocks, the leader (the first buyer, or whoever started a private group) and/or the top sharer (the buyer whose link brought the most others, from a minimum you set) get a single use coupon for their email address: an amount off, a percent off, or one more of the deal product for free.
WhatsApp first. WhatsApp is shown as the first and largest share button, with an editable message that includes the live progress and the link.
