Facilitating Inter-System Data Transfer by Leveraging First-Party Cookie Handling

A system for capturing impression data includes a server in communication with a user's computing device via a communications network. The server is configured to generate a pixel for embedding in a digital communication viewable in a web browser on the user's computing device. The pixel is served from a domain associated with the server. The server is configured to, in response to the digital communication being viewed in the web browser on the user's computing device, set a cookie on the user's computing device via the pixel. The cookie is configured to store data associated with one or more impressions of digital communications viewed on the user's computing device. The server is configured to, in response to the user's computing device accessing the domain via the web browser, receive the stored data associated with the one or more impressions from the cookie set on the user's computing device.