Verify Authy one-time token

VerifyAuthyToken.cs

private async Task<bool> VerifyAuthyTokenAsync(ILogger logger, IConfiguration configuration, string authyId, string token)
{
    var apiKey = configuration.GetSection("AuthySettings")?["ApiKey"];

    if (String.IsNullOrEmpty(apiKey))
        throw new InvalidOperationException("Invalid Authy API key.");

    using (var client = new HttpClient())
    {
        client.DefaultRequestHeaders.Add("X-Authy-API-Key", apiKey);

        HttpResponseMessage response = await client.GetAsync($"https://api.authy.com/protected/json/verify/{token}/{authyId}");

        var unauthorized = (response.StatusCode == HttpStatusCode.Unauthorized);
        var body = await response.Content.ReadAsStringAsync();

        logger?.LogInformation($"Recognized {(unauthorized ? "unauthorized" : "authorized")} token.");
        logger?.LogDebug(body);

        return !unauthorized;
    }
}