Message not sending

[sukirtisharma26]

@app.route('/sendmsg')
def sendmsg():
to = request.args.get('to')
msg = request.args.get('msg')
token = request.args.get('token')
if(str(token) == expected_token):
client = Client(login, password)
res = client.send_message(to, msg)

In the above flaskapp.py file , res returns me "None" and no message is sent.