You can find a list of all coupon codes that have already been imported under Content > Coupon codes. The remaining amount is reduced after each delivery that uses codes from the corresponding list and assigns one to each recipient.
A coupon code list can be assigned to multiple messages.
You can check whether the correct list is assigned in the Quality Control or in the Assign Coupon Code List action.
The $code variable is displayed in the preview on the creative's detail page or in the email editor. It is not displayed in the test email.
Under address research → mailing history, you can find out which coupon code has been assigned to a user.
The action Assign coupon code list is not available for:
* messages in tracking and network tracking campaigns
* DOI messages
* web push, app push, SMS, voice, print