> For the complete documentation index, see [llms.txt](https://documentation.freshpaint.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.freshpaint.io/integrations/destinations/demand-side-platforms-dsps/basis/basis-reference.md).

# Basis Reference

This is a reference document for the Basis destination. For information on how to set up this integration, see the [Basis Quick Start Guide](/integrations/destinations/demand-side-platforms-dsps/basis/basis-quick-start-guide.md)

## Destination Info

* Supports [Track](/reference/developer/freshpaint-sdk-reference.md#track) calls
* Supports [HIPAA mode](/readme/hipaa-mode.md)
* Supports [Freshpaint Impression Pixel](/integrations/impression-pixel.md)
* Supports forwarding from the [Google Tag Manager Integration](/integrations/google-tag-manager-integration.md)
* Refer to this destination as **Basis** in the [Integrations object](/reference/developer/freshpaint-sdk-reference.md#using-the-integrations-object)
  * If you've configured multiple Pixel IDs, you can choose a specific one by suffixing the Pixel ID, such as: **Basis::123456.** You can retrieve this value from Basis configuration page for the Pixel ID of interest.
* Connection Modes:

<table><thead><tr><th width="249.33333333333331" align="right"></th><th data-type="checkbox">Client-side</th><th data-type="checkbox">Server-side</th></tr></thead><tbody><tr><td align="right">Web</td><td>false</td><td>true</td></tr><tr><td align="right">Mobile</td><td>false</td><td>true</td></tr><tr><td align="right">Server</td><td>false</td><td>true</td></tr></tbody></table>

## Click Through Tracking

In order for Freshpaint to be able to automatically capture the click ID auto-generated by the Basis advertisement, [cookieless conversion attribution needs to be enabled](https://help.basis.com/docs/Cookieless_Conversions/Cookieless_Conversions_Guide.htm).

Basis will append a `cntr_auctionId` parameter to the landing page URL query string, which works similar to click id's from other advertising platforms. Freshpaint when installed on a page will look for this click id and automatically set the `$cntr_auctionId` event property with the click id.

Assuming you have followed the [Basis Quick Start Guide](/integrations/destinations/demand-side-platforms-dsps/basis/basis-quick-start-guide.md) to set up your Basis destination, you can verify that click through tracking is working by looking for an event in event verification that contains the `$cntr_auctionId` field.

<div align="center" data-full-width="true"><figure><img src="/files/X5LhNAIrCfPHWvV0SdOo" alt=""><figcaption><p>Event Verification</p></figcaption></figure></div>

<div data-full-width="true"><figure><img src="/files/LtepHb8rj16UDJu79VvJ" alt=""><figcaption><p>Click ID being captured</p></figcaption></figure></div>

## View Through Tracking

Freshpaint supports view through tracking by capturing the `cntr_auctionId` passed in by Basis using the Freshpaint Impression Pixel. Assuming you have followed the [Basis Quick Start Guide](/integrations/destinations/demand-side-platforms-dsps/basis/basis-quick-start-guide.md) to set up your Basis destination, you can verify that view through tracking is working by looking for an event in event verification that contains the `$cntr_auctionId` field, similar to how you can verify Click Through Conversion.

You can also look for a transformation that shows that the event data was enriched by the Freshpaint Impression Pixel.

<div data-full-width="true"><figure><img src="/files/euy7R8qDhZDo0ojXGOwu" alt=""><figcaption><p>Transformation applying the Impression Pixel captured impression to an event</p></figcaption></figure></div>

## Relevant Properties

<table data-header-hidden data-full-width="true"><thead><tr><th width="224"></th><th width="269"></th><th width="86"></th><th width="113"></th><th align="center"></th></tr></thead><tbody><tr><td><strong>Freshpaint Property</strong></td><td><strong>Basis Parameter</strong></td><td><strong>Type</strong></td><td><strong>Required?</strong></td><td align="center"><strong>Description</strong></td></tr><tr><td><code>$cntr_auctionId</code></td><td><code>cntr_postbackAuctionId</code></td><td>string</td><td>Required</td><td align="center"><code>cntr_auctionId</code> is appended to the landing page URL by Basis. <strong>Freshpaint will automatically capture cntr_auctionId for events from your website</strong>. For events from other sources you would need to provide <code>$cntr_auctionId</code> as an event property.<br><br>If the Freshpaint Impression pixel is in use, <code>cntr_auctionId</code> is added automatically as a transformation to the appropriate events if a match is found.</td></tr><tr><td><code>&#x3C;custom_property></code></td><td><code>&#x3C;custom_property></code></td><td>string</td><td>Optional</td><td align="center">Any additional / custom properties on the event and allowed by the HIPAA allow list will be passed to Basis</td></tr></tbody></table>