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| 1 | +--- |
| 2 | +title: ID Sync |
| 3 | +beta: true |
| 4 | +plan: engage-foundations |
| 5 | +--- |
| 6 | + |
| 7 | +Use ID Sync to select identifiers and a sync strategy when you send Audience data to your destinations. Configure how you send identifiers, which provides more control over the data you send downstream. |
| 8 | + |
| 9 | +On this page, you'll learn how to configure and begin using ID Sync. |
| 10 | + |
| 11 | +> info "ID Sync in beta" |
| 12 | +> ID Sync is in beta, and Segment is actively working on this feature. Some functionality may change before it becomes generally available. [Contact Segment](https://segment.com/help/contact/){:target="_blank"} with any feedback or questions. |
| 13 | +
|
| 14 | +> warning "" |
| 15 | +> You must have Engage Foundations to use Trait Enrichment. |
| 16 | +
|
| 17 | +## Set up ID Sync |
| 18 | + |
| 19 | +To configure ID Sync: |
| 20 | + |
| 21 | +1. Navigate to **Engage** > **Audiences**. |
| 22 | +2. [Create a new Audience](/docs/engage/audiences/). From the **Select Destination** tab in the Audience builder, select your destination. |
| 23 | +- If you don't see any destinations to add, you'll need to [add the destination](/docs/connections/destinations/add-destination/#adding-a-destination) to your Engage space first. |
| 24 | +- For existing Audiences, you'll find your connected destination on the Audience Overview page. |
| 25 | +3. In the **Event Settings** section, you'll see two options: **Default Setup** and **Customized Setup**. To use ID Sync, select [**Customized Setup**](#customized-setup). |
| 26 | + |
| 27 | +### Default setup |
| 28 | + |
| 29 | +Default setup uses default Segment Destination behavior. To use the default settings, click **Save** and resume building your Audience. |
| 30 | + |
| 31 | +You can customize additional event settings at any time. |
| 32 | + |
| 33 | +### Customized setup |
| 34 | + |
| 35 | +With Customized setup, you can choose which identifiers you want to map downstream to your Destination. |
| 36 | + |
| 37 | +1. Using **Customized Setup**, click **+ Add Identifier** and add the identifiers: |
| 38 | +- **Segment**: Choose your identifiers from Segment. |
| 39 | +- **Destination**: Choose which identifiers you want to map to from your destination. If the destination doesn't contain the property, then outgoing events may not be delivered to your destination. |
| 40 | +- *Facebook Custom Audiences* and *Google Ads Remarketing Lists* display a dropdown for you to choose available identifiers. |
| 41 | +- *Iterable* and *Zendesk* autopopulate an open text field which you can modify. |
| 42 | +2. Add an ID strategy. |
| 43 | +- This is a strategy for a particular identifier which sends either the `last added`, `first added`, or `all` identifiers to your destination. |
| 44 | +3. Click **Save**, then finish building your audience. |
| 45 | + |
| 46 | + |
| 47 | +## Limits and best practices |
| 48 | + |
| 49 | +- Segment recommends using ID Sync with new audiences. |
| 50 | +- ID sync configuration changes apply to new data flowing after about five minutes. Changes don't apply to active or running syncs. |
| 51 | +- ID Sync used on existing audience destinations doesn't resync the entire audience. Only new data flowing into Segment follows your ID Sync configuration. |
| 52 | +- Segment doesn't maintain ID Sync history, which means that any changes are irreversible. |
| 53 | +- You can only select a maximum of three identifiers with an `All` strategy. |
| 54 | + |
| 55 | + |
| 56 | +## Frequently asked questions |
| 57 | +{% faq %} |
| 58 | +{% faqitem What's the difference between Trait Enrichment and ID Sync? %} |
| 59 | + |
| 60 | +**Trait Enrichment** maps the traits data you've collected with Engage to use when syncing audiences to destinations. |
| 61 | + |
| 62 | +**ID Sync** maps the identities data gathered for a profile for use when syncing Audiences to destinations. |
| 63 | + |
| 64 | +{% endfaqitem %} |
| 65 | + |
| 66 | +{% faqitem How do syncs differ between audiences with ID Sync and audiences without ID Sync? %} |
| 67 | + |
| 68 | +Audiences without ID Sync aren't allowed to select any strategy, and by default will send all values of an identifier to the destination. Also, audiences without ID Sync don't send any custom identifiers that are present in your space. |
| 69 | + |
| 70 | + |
| 71 | +{% endfaqitem %} |
| 72 | + |
| 73 | +{% faqitem Can I edit config once the audience has synced? %} |
| 74 | +Yes, you can edit configuration in the Destination **Settings** tab at any time. However, changes will only take place in subsequent audience syncs, or in new audiences connected to the destination. |
| 75 | +{% endfaqitem %} |
| 76 | +{% endfaq %} |
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