powershell script to trigger message in slack using web hock

    $uriSlack = "URL"
        $body = ConvertTo-Json @{
        pretext = "test"
        text = "test"
        color = "#142954"
}
try {
    Invoke-RestMethod -uri $uriSlack -Method Post -body $body -ContentType 'application/json' | Out-Null
    } catch {
    Write-Error (Get-Date) ": Update to Slack went wrong..."
    }