Automatically generated discount codes assure that your discount code can only be redeemed once. Instead of a generic code such as 'GET10OFF', each user is assigned a random code such as 'ERG%BR'. In OptiMonk, unique discount codes can either be generated automatically for Shopify stores or can be uploaded manually for custom stores.
For now, these unique codes are only available for overlay campaigns, not popups.
Embedded campaigns, instead of appearing as an overlay on your website, are embedded into a page and look as native content.
Learn more about Embedded Campaigns here: https://youtu.be/1-TUDzNWkTY