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  Installing Plesk Extensions
To install a Plesk extension, use the install operation.
Request Packet Structure
A request XML packet for an extension installation contains the install operation node:
<packet>
  <extension>
    <install>
        <url> or <id>
    </install>
  </extension>
</packet>
The install node is structured as follows:

Note: The interactive schema navigator for all request packets is available here: http://plesk.github.io/api-schemas/1.6.8.0/agent_input.svg.
- The url node is required. It holds the URL of an extension ZIP file. Data type: urlType.
- The id node is required. It specifies the ID of the extension to be installed. Data type: string.
Response Packet Structure
The install node of the output XML packet is of complex type which has the following presentation:

Note: The interactive schema navigator for all response packets is available here: http://plesk.github.io/api-schemas/1.6.8.0/agent_output.svg.
- 
result, required.
It wraps the result of the install operation. Data type:
resultType (common.xsd).
- status, required. It returns the execution status of the operation. Data type: string. Allowed values: ok | error.
- errcode, required if the operation fails. Returns error code. Data type: unsignedInt.
- errtext, required if the operation fails. Returns error message. Data type: string.
Samples
The following request packet installs an extension downloaded from the given URL:
<packet>
  <extension>
    <install>
       <url>http://extore.pp.plesk.ru/packages/43062fb1-d342-4428-9990-c28204241134-traffic-monitor/download</url>
    </install>
  </extension>
</packet>
Response:
<packet version="1.6.8.0">
  <extension>
    <install>
      <result>
        <status>ok</status>
      </result>
    </install>
  </extension>
</packet>
The following request packet installs an extension with the given ID:
<packet>
  <extension>
    <install>
      <id>wp-toolkit</id>
    </install>
  </extension>
</packet>
Response:
<?xml version="1.0" encoding="UTF-8"?>
<packet version="1.6.9.1">
  <extension>
    <install>
      <result>
        <status>ok</status>
      </result>
    </install>
  </extension>
</packet>