This is what we used to do. We used to upload a list of promo codes like THY12345, THY12346 to everyone in the list, This is mapped to a custom field called "PROMO CODE" . I think there was some data before the latest upload. No, Promo codes were not matching what was uploaded in this list and what was mapped while uploading. There was only one kind of promo codes in the file, so prior to this, we were only mapping the promo code to this custom code only, as for sending the campaign, We used this list, not any other list of promo codes or recipients.
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