I am looking to build the below Use Case.
Note : The codes are unique and generated on the third party website and uploaded to Shopify via 'Bulk Discount Generator App'.These unique codes are then linked to a product. In the above case it's an eBook.
I am currently reviewing few apps , but not exactly matching my use case
Any pointers will be appreciated
I don't have any personal experience with the app, but have you tried Digital Downloads?