$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = 'D:\folder_to_watch'
$watcher.IncludeSubdirectories = $true
$watcher.EnableRaisingEvents = $true

$action =
{
    $path = $event.SourceEventArgs.FullPath
    $changetype = $event.SourceEventArgs.ChangeType
    Write-Host "$path was $changetype at $(get-date)"

    $postdata = @{
        value1=$path
        value2=$changetype
    }
    
    # To get your key, click the Documentation link at https://ifttt.com/maker_webhooks/
    $key="your_ifttt_key"
    $event="new_file"
    
    $json = $postdata | ConvertTo-Json
    $response = Invoke-RestMethod "https://maker.ifttt.com/trigger/$event/with/key/$key" -Method Post -Body $json -ContentType 'application/json'
    write-host $response

}

Register-ObjectEvent $watcher 'Created' -Action $action

"Waiting for events.  Press CTRL-C to quit."
while($true)
{
    Start-Sleep .5
}

Here's a Powershell script you could use to watch for new processes, and call an API when one of the processes you're looking for launches. I had it call the TRIGGERcmd API, but you could easily switch it to the IFTTT Webhooks API.

Let me know if you want a file write example too.

# Define event Query
# $query = "SELECT * FROM __InstanceCreationEvent WHERE TargetInstance ISA 'Win32_NTLogEvent' "
$query = "SELECT * FROM Win32_ProcessStartTrace"

<# Register for event - also specify an action that displays the event when the event fires.#>
Register-WmiEvent -Source Demo1 -Query $query -Action {
        $processes = "mspaint.exe","calculator.exe"

        # Use this if reading Win32_NTLogEvent's:
        #  $event.SourceEventArgs.NewEvent.TargetInstance.Message
        $p = $event.SourceEventArgs.NewEvent.Properties["ProcessName"].value

        foreach ($process in $processes) {
            if ($p -eq $process) {
                Write-Host "$p launched.  Calling API."
                
                $postdata = @{
                    trigger='notepad'
                    computer='RussHP'
                    # params='optionalparameter.txt'
                }
                
                $token=Get-Content ~\.TRIGGERcmdData\token.tkn
                
                $headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
                $headers.Add("authorization", "Bearer " + $token)
                
                $json = $postdata | ConvertTo-Json
                $response = Invoke-RestMethod 'https://www.triggercmd.com/api/run/triggerSave' -Method Post -Body $json -ContentType 'application/json' -Headers $headers
                write-host $response
            }
        }
    }

"Waiting for events.  Press CTRL-C to quit."
while($true)
{
    Start-Sleep .5
}

The script I based this one on watched for entries in Event Viewer. I left those bits remarked out in case you might have that use case.