> For the complete documentation index, see [llms.txt](https://help.impact.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.impact.com/brand/what-would-you-like-to-learn-about/advocate-program/advocate-rewards/referral-promo-codes-for-participants.md).

# Referral Promo Codes for Participants Explained

{% hint style="danger" %}
**Important**: Once the feature is turned on for your program, it can’t be turned off.
{% endhint %}

Referral promo codes are a great way to condense the attribution and reward into 1 step at the **start** of the referral process. The vouchers are presented by customer advocates to referred friends and offer a discount. Once the referred friend uses their promo code upon checkout, the code is attributed to the customer advocate, who gets rewarded in turn.

You can create referral promo codes for your advocates by uploading promo codes in your program rules. Once you have your [program rules](/brand/what-would-you-like-to-learn-about/advocate-program/getting-started-with-advocate/configure-your-advocate-program.md) set up, navigate to the *Promo Codes* section to upload a batch of referral promo codes.

{% hint style="success" %}
**Note**: This feature is separate from [fuel tank rewards](/brand/what-would-you-like-to-learn-about/advocate-program/advocate-rewards/fuel-tank-rewards-explained.md). Fuel tank rewards also use codes, but these codes are only used to reward the participant—not to create an attribution between the advocate and referred friend.
{% endhint %}

Learn how to:

* [Set up referral promo codes](/brand/what-would-you-like-to-learn-about/advocate-program/advocate-rewards/referral-promo-codes-for-participants/set-up-referral-promo-codes.md)
* [Replace used promo codes](/brand/what-would-you-like-to-learn-about/advocate-program/advocate-rewards/referral-promo-codes-for-participants/replace-used-promo-codes.md)
* [View referral promo codes](/brand/what-would-you-like-to-learn-about/advocate-program/advocate-rewards/referral-promo-codes-for-participants/view-referral-promo-codes.md)

## Event Time Attribution

Referrals get attributed through user upserts, and these happen via API calls, user imports, or even widget loads. Referral promo codes can also be sent back with purchase events. You can pass the event to us in the `OrderPromoCode` from the conversions API. Learn more on how to create a [conversion event](https://integrations.impact.com/brand-api-reference/reference/conversions).


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