Why is it mandatory to have first-party information such as First Name , Last Name, Email ID, and Phone Number on the website for a better impact of Conversion API?

Why is it mandatory to have first-party information such as First Name , Last Name, Email ID, and Phone Number on the website for a better impact of Conversion API?

Having first-party information like First Name , Last Name, Email ID, and Phone Number on your website is crucial for maximizing the impact of CAPI. It helps to match the user data for any kind of campaigns & campaign performance will be improved by this first party information of users & enhances the overall effectiveness of your digital advertising campaigns. You can retarget users based on different types of audiences like those who have visited your website, added items to their cart, or made a purchase.