---
title: Identifying the parameters in install-validation postbacks
framework: storekit
role: article
role_heading: Article
path: storekit/identifying-the-parameters-in-install-validation-postbacks
---

# Identifying the parameters in install-validation postbacks

Learn about the postback parameters in all SKAdNetwork versions.

## Overview

Overview The following list describes all the possible parameters you may get in a postback, and their version availability. To verify that Apple signed the postback, see Verifying an install-validation postback. Note: The source-app-id only appears in the postback if providing the parameter meets Apple’s privacy threshold. Note: The signature doesn’t include the conversion-value. Postbacks may contain either conversion-value or coarse-conversion-value, not both. Note: The signature doesn’t include the coarse-conversion-value. Postbacks may contain either conversion-value or coarse-conversion-value, not both. To ensure crowd anonymity, Apple assigns a postback data tier to app downloads. The postback data tier determines whether certain parameters appear in the postback, as well as the number of digits in the hierarchical source identifier. The following postback parameters are subject to the postback data tier: source-identifier (affects the number of digits the postback returns) coarse-conversion-value conversion-value source-app-id source-domain country-code For more information about receiving postbacks, see Receiving postbacks in multiple conversion windows.

## See Also

### Verifying postbacks

- [Verifying an install-validation postback](storekit/verifying-an-install-validation-postback.md)