If you ship Amazon Ads code in production, this one matters. Amazon now reads user consent through a framework called the Amazon Consent Signal (ACS). Only Amazon-certified CMPs send the right values, in the right order, at the right time. If your tool is not certified, your campaign data is at risk. What ACS Actually Does ACS sits between your cookie banner and Amazon Ads systems. When a shopper picks "yes" or "no", the CMP turns that choice into a structured signal. Amazon then knows if it can use that data for ads measurement, audience modelling, or retargeting. Three things matter for the engineer: The signal must fire before any Amazon ad tag runs. It must carry granular categories (marketing, analytics, personalisation). It must be re-checked when the shopper updates choices later. How a Clean Setup Looks A working pattern usually involves: CMP script loaded synchronously in <head> so consent is known early. Amazon Ads pixels and DSP tags gated behind a consent listener.…
