Postbacks are server-to-server messages that send verified information about user actions—like installs or in-app events—from one platform to another. In mobile marketing, postbacks are a core part of attribution, allowing marketers, ad networks, and mobile measurement partners (MMPs) to stay synchronized on performance data.
When a user clicks an ad, installs an app, or performs an action within it, a postback is triggered to confirm that the event happened. This automated exchange ensures that ad networks get credit for real results and that marketers can measure campaign performance accurately.
A postback is the communication link that connects an app’s server, its ad network, and its measurement partner. It’s how one system informs another that a tracked event has occurred.
In essence, postbacks are automated data pings that complete the feedback loop between user behavior and marketing analytics.
1. Install postback
Sent when a user installs an app after interacting with an ad. This lets the ad network know that it drove an install, enabling proper attribution and cost-per-install billing.
2. In-app event postback
Sent when a user performs an in-app action after installation—such as completing a tutorial, adding an item to a cart, or making a purchase. These events help marketers understand engagement, retention, and revenue performance.
Here’s how a typical postback flow looks:
This process happens in real time and often involves multiple partners and tracking URLs with embedded parameters.
Accurate attribution
Postbacks confirm which ad or channel actually drove each install or conversion, preventing duplicate credit.
Campaign optimization
By analyzing postback data, marketers identify which channels, audiences, and creatives perform best, enabling better resource allocation.
Performance transparency
Advertisers and networks see verified results instead of relying on unconfirmed clicks or impressions.
Budget efficiency
Postbacks reduce wasted ad spend by distinguishing real engagement from fraudulent or misattributed traffic.
Retargeting and personalization
Event postbacks help build remarketing audiences by signaling valuable user behaviors while respecting privacy rules.
Apple’s SKAdNetwork (SKAN)
SKAdNetwork is Apple’s privacy-preserving attribution framework. Instead of sending user-level data, SKAN sends aggregated postbacks to advertisers or their MMPs with limited details about campaign performance.
Postbacks under SKAN include install data and a “conversion value” that represents post-install activity—without revealing personal identifiers.
Marketers must interpret these values and time windows to understand performance while staying compliant with Apple’s App Tracking Transparency (ATT) framework.
Google is building a similar privacy-first model for Android. Postbacks here also deliver anonymized conversion data that advertisers can use for optimization without tracking individuals.
While the terms are often used interchangeably, there’s a subtle distinction:
In marketing, “callback” may describe the technical request, while “postback” refers to the data exchange that communicates attribution.
1. Validate endpoints
Ensure your receiving URLs are secure and support HTTPS. Unauthorized endpoints can expose user or campaign data.
2. Use timestamps and signatures
Include cryptographic signatures or tokens to verify authenticity and prevent replay attacks or duplication.
3. Customize event mapping
Select only the events that drive business outcomes to avoid unnecessary data noise.
4. Monitor delivery logs
Check regularly for missing or delayed postbacks, which can indicate configuration or fraud issues.
5. Respect privacy settings
Always honor platform-level user consent (ATT, GDPR, CCPA). Do not send personal identifiers if users have opted out.
To confirm and share event data—like installs or purchases—between an app, its measurement partner, and the ad source for accurate attribution and optimization.
Install postbacks confirm the app install after an ad click. Event postbacks track user actions inside the app after the install.
No. Modern postbacks should not contain any user-identifiable information. They typically use anonymous identifiers or aggregated metrics to comply with privacy laws.
SKAN limits postback frequency and detail. It sends anonymized data within a delayed window to protect user privacy, combining installs and events in one report.
They provide verified, real-time insight into campaign effectiveness and user quality, allowing data-driven adjustments and fraud prevention.