> ## Documentation Index
> Fetch the complete documentation index at: https://auth0.generaltranslation.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Type Alias: IdentifierType

<ParamField body="IdentifierType" type="&#x22;phone&#x22; | &#x22;email&#x22; | &#x22;username&#x22;">
  Type representing valid identifier values
</ParamField>