Problem: Created coupon but it doesn't show in coupons list Verify Portal API client is configured and connected to server Check for error message in modal upon save Refresh the page if save appeared to succeed Ensure you have edit_posts capability required for coupon management Check WordPress error logs for API communication issues Problem: Customer enters coupon code but gets validation error Verify coupon code spelling matches exactly (case sensitive) Check coupon start date hasn't passed (if Starts At set) Check coupon hasn't expired (if Expires At set) Verify usage count hasn't exceeded max uses If client restricted: confirm customer is logged in as that client If product restricted: confirm cart contains that product Test coupon directly in admin to isolate the issue Problem: