如何使用密钥文件验证SpeechClient V1（PHP / Laravel）

Question

I'm trying to authenticate the SpeechClient using 'keyFilePath' and 'projectId' parameters like so:

$speech = new SpeechClient([
            'projectId' => 'actualProjectId,
            'keyFilePath' => $key_path,
        ]);

If I use Google\Cloud\Speech\SpeechClient - Everything works fine, but if I use Google\Cloud\Speech\V1\SpeechClient I end up with an error: Could not construct ApplicationDefaultCredentials

I've read Google docs for Setting Up Authentication but still don't understand what am I doing wrong.

I need the V1 (in fact V1p1beta1) for additional features that are not available using the old SpeechClient.

Any ideas?

P.S. Using Laravel as the back-end.

Answer 1

For clients within the V1, etc. namespaces, pass the keyFilePath as credentials.

new SpeechClient([
    'credentials' => $key_path
]);