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# UpdateFaceMetadata

Updates the value of a key-value pair in the custom metadata of a face.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`database` | The name of the database that contains the face. | Yes
`identifier` | The identifier of the face for which you want to update metadata. | Yes
`key` | The key of the key-value pair to update. | Yes
`newvalue` | The new value (maximum 254 bytes). | Yes

## Example

    /action=UpdateFaceMetadata&database=politicians
                              &identifier=6600dc0f9dd72d0cb55589e8f1d28b62
                              &key=role
                              &newvalue=minister%20defence

## Response

    <autnresponse>
      <action>UPDATEFACEMETADATA</action>
      <response>SUCCESS</response>
      <responsedata></responsedata>
    </autnresponse>

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