PowerShell

Add-Type -AssemblyName System.Net.Http

$interactUrl = "{URL to your interact intranet}"
$profileSourceApiKey = "{Profile Source API key - this is set when creating the profile source in Interact"
$profileSourceId = "{ID of the profile source in Interact}"
$filePath = "{Path to files on the filesystem}"

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

function ProcessFiles(){
    Get-ChildItem $FilePath | 
      Foreach-Object {
        $personId = $_.BaseName

        $baseUri = $interactUrl + "/api/umi/" + $profileSourceId + "/upload/" + $personId + "/picture"

        SendFile $baseUri $_.FullName
      }
}


function SendFile([string]$uri, [string]$path){
 
	$httpClientHandler = New-Object System.Net.Http.HttpClientHandler
    $httpClient = New-Object System.Net.Http.Httpclient $httpClientHandler

    $packageFileStream = New-Object System.IO.FileStream @($path, [System.IO.FileMode]::Open)
        
    $contentDispositionHeaderValue = New-Object System.Net.Http.Headers.ContentDispositionHeaderValue "form-data"
	$contentDispositionHeaderValue.Name = "fileData"
	$contentDispositionHeaderValue.FileName = (Split-Path $path -leaf)
 
    $streamContent = New-Object System.Net.Http.StreamContent $packageFileStream
    $streamContent.Headers.ContentDisposition = $contentDispositionHeaderValue
    $streamContent.Headers.ContentType = New-Object System.Net.Http.Headers.MediaTypeHeaderValue "image/jpeg"
        
    $content = New-Object System.Net.Http.MultipartFormDataContent
    $content.Add($streamContent)
 
    $httpClient.DefaultRequestHeaders.Add("X-ApiKey", $profileSourceApiKey)

    try
    {
	    $response = $httpClient.PostAsync($Uri, $content).Result
 	}
    catch [Exception]
    {
		# log it
    }
    finally
    {
        if($null -ne $httpClient)
        {
            $httpClient.Dispose()
        }
 
        if($null -ne $response)
        {
            $response.Dispose()
        }
    }
}

ProcessFiles