You might not be getting referral credits through the Amazon Affiliate Program for several reasons. First, check that you are using the correct affiliate links and that they are properly formatted. Ensure that your visitors are clicking on the links and completing the purchase within 24 hours. If they don’t make a purchase or if they return the item, you won’t receive credit. Also, verify that your traffic sources comply with Amazon’s terms. Avoid spammy tactics, as Amazon may reject referrals from such sources. Finally, ensure your account is active and properly set up in the Amazon Affiliate Program.