auth with the Azure translator api

translator-api-auth.cs

private async Task<string> GetTokenAsync()
{
    string key = "--- YOUR API KEY HERE ---";// Environment.GetEnvironmentVariable("SKYPE_KEY");
    if (string.IsNullOrEmpty(key))
    {
        Debug.Log("Please set an environment variable named 'SKYPE_KEY' to your Skype api key");
        return string.Empty;
    }

    // First retrieve a time-restricted key to use to access the API (will need to write code
    // to refresh this later).
    _http = new HttpClient();
    _http.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", key);
    Debug.Log(key);
    var url = string.Format("https://api.cognitive.microsoft.com/sts/v1.0/issueToken");
    Debug.Log(url);
    var resp = await _http.PostAsync(url, null);
    resp.EnsureSuccessStatusCode();
    var token = await resp.Content.ReadAsStringAsync();
    return token;
}