In order for the Twitter Ads service to optimize on app installs it must be informed when an app install (and usually initial app launch) occurs. For iOS, at least, this requires some type of tracking SDK to be incorporated into the app being promoted. There are many tracking services out there, such as Tune, Kochava, AppsFlyer, and Adjust.
Question 1: Is there a list of third-party tracking services that have been integrated with Twitter’s install optimization?
Question 2: Is having Fabric incorporated into the app sufficient (or necessary)? If so, are any additional API calls required beyond the basic integration to enable install recording?
There is an older reference to this topic in the forums here, but the article referenced by the answer no longer exists at the address given.