You can link a Google Play developer account to Campaign Manager to easily track app installs as part of your mobile app promotion campaigns, without adding or implementing any code. This makes it easy to get started on app install campaigns without having to make changes in your Android app.
Before you can track installs from Google Play, you must link your Campaign Manager advertiser to a Google Play developer account associated with your advertiser's app.
In Campaign Manager, start in your advertiser's Floodlight configuration tab, and expand the Google Play account section, then click Link to a Play account.
Enter the email address of the Google Play account owner, then save your Floodlight configuration to send the link request. This will send an email notification to the developer asking them to visit Google Play developer console to approve (or deny) your account linking request.
Wait for the app developer to approve your request in Google Play developer console.
If you've been waiting for a few days and still haven't been approved or rejected, you can come back to the Google Play account section of your advertiser's Floodlight activities to click Send reminder to send another email to the app developer.
Once your linking request has been approved, you can create Floodlight activities that correspond to app installs from Google Play.