PowerShell script to post a notification to a chat room

NotifyHipchat.ps1

$apitoken = <redacted>
$roomid = "20"
$messageText = "message_goes_here"
$color = 'yellow'

$body = @{
    color = $color
    message = $messageText 
    notify = $true
    message_format = "text"
}

$uri = "https://<hipchat_domain_name>/v2/room/$roomid/notification?auth_token=$apitoken"
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Invoke-RestMethod -Method Post -Uri $uri -Body $body