[android-developers] What parameters are needed send C2DM messages?

I am writing the third party application server part of the C2DM
messages. I've signed up and have the following:
sender_id = myapp@abc.com
application_id = mycompany.test

Using the above two pieces of information I can register on the mobile
and can send the registration id to my application sever. Now, to send
a message to the device through google server https://android.clients.google.com/c2dm/send
I have the data for parameters: registration_id, data, etc.

My question is how do I get the client login auth information
(GoogleLogin auth) that is needed in the header? Should the mobile
application collect user information and get the login auth
information on the phone and send it to the third party server? Or
should the mobile application user send the Google credentials to the
third party server and the server stores it? Or is there any other
way?

Also, what should be in the collapse_key?

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