Microsoft Advertising Releases Conversions API Documentation
▼ Summary
– Microsoft Advertising has launched a beta for its Conversions API (CAPI), a server-side solution that lets advertisers send conversion data directly from their own systems.
– CAPI supports online and offline events, aiming to improve measurement accuracy, increase attribution coverage, and reduce reliance on browser-only tracking.
– Microsoft recommends using CAPI alongside Universal Event Tracking (UET), not as a replacement, to ensure full measurement coverage when browser signals are limited.
– CAPI is still in beta, not available to all accounts, and requires technical resources for server-side integration, making it more complex than a browser tag.
– The move reflects the industry trend toward combining server and browser signals, positioning server-side measurement as a standard part of advertising stacks.
Microsoft Advertising has rolled out official documentation for its Conversions API (CAPI) , a server-side measurement tool currently in beta that gives advertisers a fresh route for transmitting conversion data directly to the platform. This move reduces the need to lean entirely on browser-based tracking methods.
The newly published docs outline how CAPI allows businesses to send conversion and customer interaction data straight from their own backend systems to Microsoft Advertising via a single, unified connection. The API is designed to handle a broad range of measurement scenarios, covering both online and offline events.
According to Microsoft, the potential payoffs are substantial. Advertisers can expect improved conversion measurement accuracy, expanded attribution coverage, and the ability to push both digital and physical-world events through one integration. The system also supports multiple measurement use cases simultaneously, all through a single server-to-server link.
A key recommendation from Microsoft is to run CAPI alongside Universal Event Tracking (UET) rather than swapping one for the other. UET remains responsible for capturing in-browser activity, while CAPI handles the direct server-to-server transmission of event data. Combining the two gives marketers a more complete picture, especially when browser signals are missing or restricted.
Why this matters for advertisers is clear. CAPI offers another mechanism to preserve conversion signals and link online campaigns to actions that occur outside the browser, such as in-store purchases or phone calls. For teams already using server-side measurement on other ad platforms, this solution could simplify building a consistent cross-channel measurement framework.
There are caveats, though. CAPI is still in beta, meaning it isn’t available to every Microsoft Advertising account just yet. Additionally, setting it up requires technical know-how to establish and maintain the server-side connection, which is a heavier lift than simply dropping a tracking pixel onto a webpage.
Looking at the broader industry, Microsoft is aligning with the growing trend of blending browser and server-side data instead of depending solely on tracking codes. The release of this documentation signals that server-side measurement is evolving from a niche, advanced tactic into a standard component of modern advertising stacks.
(Source: Search Engine Land)
