# Set up Aggregated Event Measurement

### About Aggregated Event Measurement for IOS devices.

{% hint style="info" %}
Aggregated Event Measurement will let you send up to 8 different Pixel Events or Conversions per domain according to their priority.\
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This only applies to IOS users who opted out of tracking.\
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**If a shopper takes multiple actions on your site within the conversion window, only the highest priority event will be sent.**\
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📝For example, if the shopper makes it to the thank you page, only the purchase event will be used for retargeting or optimization, even though they did go through view content, add to cart, or other upper-funnel events.
{% endhint %}

### Preparation

{% hint style="info" %}

* You need to have admin access to the Business Manager account.
* Your Business Manager must have access to the Facebook Pixel you want to configure the AEM for.
  {% endhint %}

### Configure 8 events/conversions in Aggregated Events Measurement

#### Go to Web event configuration

![](https://2018944329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6nRvcVoGY4QrsHN9eWVJ%2Fuploads%2F7sOQHl5hFZG8XSOpJLIP%2FGroup%2028%20\(1\).png?alt=media\&token=f8c4d465-ad06-484f-b365-4cf6bbddcc3e)

#### Select the events you want to prioritize for targeting and optimization

![](https://2018944329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6nRvcVoGY4QrsHN9eWVJ%2Fuploads%2F97bBplZcQ42PjPCIZNQW%2FGroup%2029.png?alt=media\&token=9e30a21c-c9a6-49ec-abfd-c75700b32965)

<details>

<summary>Can I select custom events to prioritize in the AEM?</summary>

You can't directly select them but they're available for prioritization. Just [create a custom conversion](https://www.facebook.com/business/help/462806641140703?id=1205376682832142) based on the custom events first, then you'll be able to select that custom conversion as 1 prioritized conversion.

</details>

{% hint style="info" %}
**Custom events:** if you have some custom click events you want to track, definitely check out how to do that with Two Owls :point\_down:
{% endhint %}

{% content-ref url="../../custom-events" %}
[custom-events](https://docs.twoowls.io/getting-started/custom-events)
{% endcontent-ref %}