Twilio: Accessing IBM Watson Speech-to-text results payload

New Twilio developer here. My app uses the IBM Watson Speech-to-text Add-on, but I'm having trouble accessing the results payload in my callback. I can't find helpful documentation or any discussion of the issue in forums.

What I know/What I've tried

The payload resource exists – I'm able to access it directly via browser.

Using the syntax prescribed by the Twilio PHP helper library client returns a 61005 "Bad request" error:

    $request = $client->v1->lookups
               ->phoneNumbers("+1XXXXXXXXXX")
               ->fetch(
                       array(
                             "AddOns" => "ibm_watson_speechtotext",
                       ));

Using cURL to get the resource directly has been equally unfruitful, returning an empty string.

    $request = json_decode($_REQUEST['AddOns']);
    error_log("URL: ".$request->results->ibm_watson_speechtotext->payload[0]->url);
    $ch = curl_init($request->results->ibm_watson_speechtotext->payload[0]->url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
    curl_setopt($ch, CURLOPT_USERPWD, "$account_sid:$token");
    $json = curl_exec($ch);
    if($json === false) {
        error_log("cURL error: ".curl_error($ch));
        error_log(print_r($json,true));
    }
    curl_close($ch);
    $obj = json_decode($json);

Any recommendations?

Solution

The following resources should help you find the results you're looking for.

Your first code snippet above doesn't apply (Lookup is a different product). instead you will want to use the add-on results api to grab the results. https://www.twilio.com/docs/api/add-ons/results-api

For your second snippet, you will need to enable follow redirect option with CURL.

Clients will need to follow the redirect to receive the data associated with a Payload resource.

These may also help as you explore add-ons:

https://www.twilio.com/docs/api/add-ons/using-add-ons#add-on-results-available-callback and https://www.twilio.com/docs/guides/voice/how-to-use-recordings-add-ons-in-python