title: Adding Password to Logon message with QuickFix
body: <p>Hi there I am having issues with Quick Fix python. I need to add Tag 554 to my outbound Logon message to send messages in to the exchange as it is required but I am unsure how to go about this. All the online examples I find are C++ code and my attempts to translate those to Python are not successful.</p>
  
  <p>If someone could advise how to send Logon messages out with a password tag it would be appreciated:</p>
  
  <pre><code> def toAdmin(self, sessionID, message):
          message.getHeader().setField(554, "password")
  </code></pre>