> ## Documentation Index
> Fetch the complete documentation index at: https://docs.particle.pro/llms.txt
> Use this file to discover all available pages before exploring further.

# promo_code_invalid

> The promo code does not exist or is no longer active

|                 |                      |
| --------------- | -------------------- |
| **HTTP status** | `400 Bad Request`    |
| **Error code**  | `promo_code_invalid` |

## What happened

The promo code you supplied — at registration, plan selection, or redemption — doesn't match any active promotion. It may be misspelled, expired, or deactivated.

## How to fix

<Steps>
  <Step title="Retry without the promo code">
    The request succeeds without the `promo_code` field; only the discount is affected. Surface the invalid code to the user rather than guessing a replacement.
  </Step>
</Steps>