Performance Max and Smart Bidding copy whatever you tell them counts as success. If the conversion action fires on the thank-you page twice, or counts an add-to-cart as a sale, the system optimizes for the wrong people with total confidence. Before changing campaigns, your specialist checks that purchases are recorded once, with the correct order value and currency, and that enhanced conversions are set up where your platform allows it.
Stores with meaningful return rates or subscription reorders benefit from sending adjusted values back into Google Ads, so the bidding sees net revenue rather than a gross figure. Consent mode and the cookie banner also matter here: they change how much data reaches the account, and a store that ignores them can see reported sales drop without any real change in orders.
Separating new customers from people who already know you
Branded searches and past buyers convert easily, which makes them look like the most efficient part of any account. Google Ads offers new customer acquisition goals and customer list exclusions so you can see what the campaigns do for growth, instead of paying to reach shoppers already on their way to your site.