ACS - login user - did the API change?

here is the link to the user login method exposed trough REST: http://docs.appcelerator.com/cloud/latest/#!/api/Users-method-login

However, If I try to send the request: http://api.cloud.appcelerator.com/v1/users/login.json?key=My application key and I send the Headers :login=myappuserId@yahoo.com&password=somePass

I get { "meta": { "status":"fail", "code":400, "message":"400 Bad request. Please provide Cocoafish App Key or Oauth Key." } }

Can you please tell me how can I include Cocoafish App Key or Oauth Key? I sent the app Id as a query parameter, but I don't know how to send the Cocoafish App Key or Oauth Key, and this is not explained by the documentation