Yes, Coupon codes used for each sale that partner generates are visible in the reports with each conversion, in conversion report (https://members.dcmnetwork.com/publisher/#!/conversion)
- Filter the data using "Report Options", the parameter Sub ID passes the code used on purchase.
- Here's the API Endpoint to Get conversions.
- When using API, you may call this parameter to get the coupon data: Stat.affiliate_info
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NOTE: The same API Endpoint needs to be used to get transactions for Offers based on Link Attribution