> For the complete documentation index, see [llms.txt](https://addressable.gitbook.io/knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://addressable.gitbook.io/knowledge-base/event-tracking/addressable-pixel/cid-integration-via-addressable-pixel.md).

# CID Integration via Addressable Pixel

This guide explains how to send your internal CID over the Addressable Pixel.

Sending your internal CID allows Addressable to send you valuable data about your customers, so you can correlate them with their contact details and reach them with special offers.

## Step 1: Add the Addressable Pixel using one of two options

1. [Google Tag Manger](https://addressable.gitbook.io/knowledge-base/event-tracking/addressable-pixel/pixel-via-google-tag-manager-gtm)<br>
2. [Javascript SDK](https://addressable.gitbook.io/knowledge-base/event-tracking/addressable-pixel/pixel-via-javascript-sdk-js)

## Step 2: Add the internal CID as a custom property

1. Add your internal CID as a custom property to the Addressable basecode and name it user\_id. The internal CID will be added as a property to every pageview.

<figure><img src="https://2800906092-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FlmvdGU0ER07OAwIyiroz%2Fuploads%2FClVyRVpKffyvtKhjrsd5%2Fimage.png?alt=media&amp;token=1f7eaec9-88bc-4b90-bebd-16c3e496d97e" alt=""><figcaption></figcaption></figure>

2. Make sure your internal CID is populated within pageviews after users sign up or log in.<br>
3. If the internal CID is not populated within pageview events, add two custom events for signup and login, and add the internal CID as a custom property for each of them.\
   \
   `window.__adrsbl.run('signup', true, [`\
   `{ "name": "user_id", "value": "123D432" },`\
   `]);`\
   \
   `window.__adrsbl.run('login', true, [`\
   `{ "name": "user_id", "value": "824A235" },`\
   `]);`\ <br>
4. If you're sending the internal CID with s2s signup and login events, the user\_id property should be populated with our cookie \_\_\_adrsbl\_nonce, and your internal CID should be delivered by an additional custom property called internal\_cid."


---

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