I have code for sending SMS using WhatsApp API but it is not Working and throw a error "Login failed" Not Authorized.

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C#

.NET

API

WhatsApp

protected void btnsend_Click(object sender, EventArgs e)
{
try
{
string from = "91******76";
string to = txtTo.Text;
string msg = txtMessage.Text;

WhatsApp wa = new WhatsApp(from,"Ka*************8Pc8=","Parish", true, true);

wa.OnConnectSuccess += () =>
{
wa.OnLoginSuccess += (phoneNumber, data) =>
{
lblAlert.Text += "Connected to whatsapp...";
wa.SendMessage(to, msg);
lblAlert.Text += ("Message Sent !").ToString();
};

wa.OnLoginFailed += (data) =>
{
lblAlert.Text += ("Login Failed, " + data + " ").ToString();
};
wa.Login();
};

wa.OnConnectFailed += (ex) =>
{
lblAlert.Text += ("Connection Failed...").ToString();
};
wa.Connect();
}
catch (Exception ex) { }
}