# UpdateClassMetadata

Updates the value of a key-value pair in the custom metadata of an object class.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`classifier` | The name of the classifier that contains the object class. | Yes
`identifier` | The identifier of the object class 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=UpdateClassMetadata&classifier=vehicles
                               &identifier=6600dc0f9dd72d0cb55589e8f1d28b62
                               &key=note
                               &newvalue=expected%20background%20objects

## Response

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

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