If you have received an audio promotion code you can follow these instructions on how to ​claim it:
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 1. Go to Audible.com 
 2. Go to the footer of the Audible page
 3. Select   Redeem a Promotional Code
 4.   Enter your promotional code and click redeem
 
Please note both the ACX recipient and redeemer of the promo codes are bound by Audible’s Promotional Code Terms and Conditions.