You're working with an online car rental agency on a new ad campaign. They use Campaign Manager 360 and want to use a Google solution to measure app conversions. They're comfortable with coding.What solution would you recommend to meet their needs?

For an advertiser comfortable with coding who needs to measure app conversions within the Campaign Manager 360 ecosystem, Google Analytics 4 is the recommended solution because it serves as the primary engine for cross-platform measurement and sophisticated app-event tracking. While third-party SDKs are an alternative, GA4 offers the most seamless integration with the Google Marketing Platform, allowing the car rental agency to implement specific code events—such as "booking_complete" or "app_open"—and then link that data directly back to their CM360 campaigns for unified reporting. This approach leverages the Firebase SDK (the backbone of GA4 app tracking) to capture granular conversion data that is more robust than simple install metrics, providing the advertiser with the technical flexibility they desire to map out the entire user journey from ad click to in-app conversion.