ConnectWise API through AutoIt

Hello everyone. ConnectWise is a program that stores customer data, allows techs to document their time, store inventory information and more. I am very new to HTTP posts, gets, requests, things like that. To keep things simple, I want to use the simplest API: retrieve the ConnectWise version.  Here are the instructions they give:

We provide a means of accessing the API via direct HTTP POST calls. Get requests are also allowed, but are discouraged.

The entry point for plain HTTP is:
http://<psa public sitename>/v4_6_release/services/system_io/integration_io/processclientaction.rails

You will pass the actionString as a form element with a name of "actionString."

Here is the request:

<?xml version="1.0" encoding="utf-16"?>

<GetConnectWiseVersionAction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<IntegrationLoginId>integratorUsername</IntegrationLoginId>

<IntegrationPassword>integratorPassword</IntegrationPassword>

<CompanyName>companyId</CompanyName>

</GetConnectWiseVersionAction>

Can someone provide some example AutoIT code that allows me to receive the version? Thank you very much in advance!