I do think it is possible, making a POST request using the workflow REST API.

On the workflow machine visit this page to see what URI's to use and JSON body examples

http://localhost/Workflow/api/help

This is how Forms is able to start workflows

Late to the party, just saw this post. Here is a rough example of how to use PHP to POST to workflow web services using cURL. You may have to tweak a bit depending on your organizations setup.

<?php

    $handle = curl_init();

    $url = "http://WORKFLOW-LINK-HERE";

    $data = ["ParameterCollection" => [["Name" => "Message",
                                        "Value" => "Hello World!"],
                                       [
                                        "Name" => "Message Two",
                                        "Value" => "Hello World!"
                                       ]]];

    $data = json_encode($data);

    curl_setopt_array($handle,

    array(
        CURLOPT_URL => $url,
        CURLOPT_POST => true,

        CURLOPT_HTTPHEADER => array(                                                                          
            'Content-Type: application/json',                                                                                
            'Content-Length: ' . strlen($data)
        ),

        CURLOPT_POSTFIELDS => $data,
        CURLOPT_HTTPAUTH => CURLAUTH_NTLM,
        CURLOPT_USERPWD  => "DOMAIN\\ACCOUNT:XXXXX", // STORE ACCOUNT INFO SECURE, NOT PLAINTEXT, EXAMPLE ONLY
        CURLOPT_RETURNTRANSFER => true
    )

  );

    $output = curl_exec($handle);

    curl_close($handle);

    echo $output;

?>

Note, this example is only on a test server, when POSTing to https you might have to take extra measures with cURL.

Hi Olivier,

Yes, as Chad mentioned you can do so using the Workflow Web Services API.

Please see my post here for a working example: https://answers.laserfiche.com/questions/168986/Discussion-Will-Laserfiche-ever-get-a-unified-RESTful-HTTP-API#169285

Hi Chad,

Thanks for your help.

I tried to understand your solution but unsuccesful.

Do you have an exemple?