The information about Plesk updates is held by the updates node, which is presented by complex type updatesOutput (server_output.xsd). The node is structured as follows:

• The available_update node is required. It holds the version of the latest available update. Data type: string.
• The available_update_type node is required. It holds the type of the latest available update. Data type: string. Allowed values: Security | Important | Recommended | Optional.
• The security_updates node is required. It holds the total number of missed security updates. Data type: string.
• The last_installed_update node is required. It holds the version of the latest installed update. Data type: string.
• The install_updates_automatically node is required. It indicates whether the automatic update option is turned on in Plesk. Data type: boolean.

A response packet received from server can look as follows:

<packet>
  <server>
    <get>
      <result>
        <status>ok</status>
        <updates>
          <available_update>17</available_update>
          <available_update_type>Important</available_update_type>
          <security_updates>1</security_updates>
          <last_installed_update>15</last_installed_update>
          <install_updates_automatically>0</install_updates_automatically>
        </updates>
      </result>
    </get>
  </server>
</packet>