is this api still working

I tried your api with the example code in read.me I got 401 error
I am trying to use your api via example code that u share when I run I got 401 error in GSpeechDuplex.class
I release that you didnt add google api key, blow code block that u use in GspeechDuplex.class.

```
String API_DOWN_URL = "https://www.google.com/speech-api/full-duplex/v1/down?maxresults=1&pair=" + PAIR;
String API_UP_URL = "https://www.google.com/speech-api/full-duplex/v1/up?lang=" + this.language + "&lm=dictation&client=chromium&pair=" + PAIR + "&key=" + this.API_KEY + "&continuous=true&interim=true";
Thread downChannel = this.downChannel(API_DOWN_URL);
Thread upChannel = this.upChannel(API_UP_URL, tl, af);
```

There is no google api key in API_DOWN_URL