In developer website
there is a Sender Auth Token in the credentials but how to get it?
Please tell me the steps as it is not clear to me.
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as Written in Documentation like below.
Sender Auth Token :An API key that is saved on the 3rd-party application server that gives the application server authorized access to Google services. The API key is included in the header of POST requests that send messages.
you can get API KEY from you from HERE
you can get more informations here
EDITED
GCM SERVER SIDE IMPLEMENTATION IN DRUPAL