PowerShell function that sends a message to Slack

NotifySlack.ps1

function NotifySlack($webhookurl, $channel, $message)
{
    $payload = @{
        "channel" = $channel
        "icon_emoji" = ":robot_face:"
        "text" = $message
        "username" = "Mr. Robot"
    }
    Invoke-WebRequest -UseBasicParsing -Body (ConvertTo-Json -Compress -InputObject $payload) -Method Post -Uri $webhookurl | Out-Null
}