<p>The name of the IAM user associated with the service-specific credential. If this value is not specified, then the operation assumes the user whose credentials are used to call the operation.</p> <p>This parameter allows (through its <a href="http://wikipedia.org/wiki/regex">regex pattern</a>) a string of characters consisting of upper and lowercase alphanumeric characters with no spaces. You can also include any of the following characters: _+=,.@-</p>

<p>The unique identifier of the service-specific credential. You can get this value by calling <a>ListServiceSpecificCredentials</a>.</p> <p>This parameter allows (through its <a href="http://wikipedia.org/wiki/regex">regex pattern</a>) a string of characters that can consist of any upper or lowercased letter or digit.</p>