---
title: "Unique source contact identifier value accessor"
slug: "unique-source-contact-identifier-value-accessor"
abstract: "Introduction to the Unique source contact identifier value accessor in Sitecore Data Exchange Framework."
---
# Unique source contact identifier value accessor

This value accessor provides the ability to read and write contact identifiers.

| Expected source/target object type | `Sitecore.DataExchange.Providers.XConnect.Models.ContactModel` |
| --- | --- |
| Template location | *Data Exchange/Providers/xConnect/Data Access/Value Accessors/xConnect Unique Source Contact Identifier Value Accessor* |

<details>
<summary><h2>Template fields</h2></summary>

| Field name | Description |
| --- | --- |
| Identifier Source | The source for the contact identifier. |
| Identifier Type | The type for the contact identifier. |
| Do Not Overwrite Existing Value | If you select this and the contact identifier already exists on the contact, the existing identifier is not replaced. If you leave it unselected and the contact identifier already exists on the contact, the existing identifier is replaced with the new identifier. |

</details>