OneSignal, Inc.
OneSignal provides SDKs and APIs to help developers “send push notifications, in-app messages, SMS, and emails.” 
For that, it also offers personalization
, user segmentation
, and A/B testing
features. Developers can “send personalized messages based on real-time user behavior, […] user attributes, events, location, language, and more”.
Audience cohorts can be synced from various analytics providers.
Additionally, OneSignal offers analytics features. Developers can “[c]reate an understanding as to how [their] messaging drives direct, indirect, and unattributed user actions” and “[e]asily quantify which messages are driving sales, engagement, and more”.
OneSignal advertises with helping developers “know precisely when a device receives a notification”, even if “[u]sers uninstall apps, swap phones, turn off their phones, or are unreachable”.
Analytics data can be shared with various third-party tracking companies using integrations.
Tracker adapters
Tracking companies often use serveral endpoints and data formats for the transmitted data. For each combination of endpoints and data formats, we create a distinct adapter which decodes the request and maps it to the data types. For this tracking company, we have the following adapters: