# UpdateImageComparisonMetadata

Updates the value of a key-value pair in the custom metadata of a database entry (a reference) for image comparison.

Type: synchronous

Parameter | Description | Required
--- | --- | ---
`database` | The name of the image comparison database that contains the reference. | Yes
`identifier` | The identifier of the reference 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=UpdateImageComparisonMetadata&database=ReferenceImages
                                         &identifier=6d8e53fd92e601a4b8948e1b9397e381
                                         &key=PartNumber
                                         &newvalue=8291073

## Response

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

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