private static async Task<string> GetTokenAsync(string userName, string password)
{
    var login = new { username = "mario", password = "secret" };
    var content = new StringContent(JsonConvert.SerializeObject(login), Encoding.UTF8, "application/json");
    var resp = await _client.PostAsync("api/Token", content);
    var json = await resp.Content.ReadAsStringAsync();

    var parsedObject = JObject.Parse(json);
    return parsedObject["token"].ToString();
}