You email a Black Friday code to your list. By lunch it is on three voucher sites, and strangers are using it on full-price orders.
A shared code is fine on a poster. For anything you send to a person, give each person a code of their own. WP EasyCart makes thousands of them in one press.

Open an offer in Marketing › Offers, set How customers get it to With a code, then open Bulk generate codes. Set a Prefix, How many, a Random length from 4 to 12 and Uses per code. Press Generate. You get codes like VIP-K7M2Q9, up to 10,000 at a time, each good for one use.
Generate. Send. Track.
Export codes downloads a CSV with one row per code. Load it into your email service and every customer gets their own. The same file later shows how often each code was used and the orders that used it, so you know exactly which campaign paid off.
Already have codes from a partner? Import codes from a file takes a CSV or TXT, or a pasted list. A code leaked anyway, or the order was refunded? Paste it in and choose Switch them off. Codes stay unique across every offer, so two deals never fight over one code.
Where: WP Admin › EasyCart › Marketing › Offers. Plan: PRO or Premium. See every marketing feature: offers, abandoned carts and tracking, in the same plugin as your payments, shipping and tax. No coupon add-on to buy.
★★★★★ Rated 4.5 out of 5 by 200+ store owners on wordpress.org
“To do what EasyCart allows me to do required me to install literally at least a dozen plugins.”
— fprus, wordpress.org review, July 2022
WP EasyCart PRO
One code each. Nothing to leak.
The free 14-day trial unlocks PRO on your own site, no card needed, so you can generate your Black Friday codes today. Rated 4.5 out of 5 by 200+ store owners on wordpress.org.