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

# Event Property

## What are the validation specifications for "Custom Event Attributes" that are collected by the Airbridge SDK?

***

### Category

* String
* Uppercase, lowercase and numbers are allowed
* `_` and`.` are allowed
* Maximum 128 characters

### Action, Label

* String
* Uppercase, lowercase and numbers are allowed
* `?`,`!`,`,`,`.`,`/`,`&`,`(`,`)`,`-`,`_`and spaces are allowed
* Maximum 128 characters

### Value

* Float
* Less than 10 decimal places

<Note>
  When sending postbacks to media channels, filters can be applied based on "Event Category" only. Please utilize "Event Category" to differentiate your events if this is the case.

  (e.g.)

  Event Category: `purchase`

  Event Action: `AB180`

  Event Label: `shoes`

  \=>

  Event Category: `purchase_AB180_shoes`
</Note>

<Danger>
  **Attention**

  The services provided by Airbridge (e.g. Actuals Report, Raw Data Export) follows the above validation specifications. However, the validation specifications could be different for external targets (e.g. media channel postback, third party solutions) and may result in broken data.

  **Please perform integration tests to make sure that data is properly received by external targets.**
</Danger>

<link rel="alternate" hrefLang="en" href="https://help.airbridge.io/en/developers/event-property-faq" />

<link rel="alternate" hrefLang="ko" href="https://help.airbridge.io/ko/developers/event-property-faq" />