Cordova testing Google play game services

I am currently working on Google play game services for my app, but i have great problems in testing it, because the services need the signature of my app to allow access. To be able to sign my app I have to do a release build using cordova cli, because the debug build get signed automatically. My problem now is if I want to test my app it has to signed with the key assigned to the services, but if I sign it I can no longer use chrome remote debugging.

Solutions that come to my mind would be:

1. Find out the key used to sign the debug build and give it to the services
2. Have the possibility to create a debug able build which is unsigned so I can sign it with my key
3. Create a version of the services which do not check for a signature (web version or other) but still accessible out of a cordova app

I currently work with cordova 5.0 and use the following plugin for the services access: http://ift.tt/1pHs4CC, but i have to say that I'm not totally happy with the plugin, so if you could also give me a better plugin or solution i would be happy.

I also looked at the official google api for java script (http://ift.tt/1kVxeOr), but wasn't able to get it to work in my cordova app. Any solution here would also be the appreciated.

Thanks and Greetings, FallenRiteMonk