The C3 manual in plugin reference -> google Play says:
To do this, in the Developer Console under Game details, find the header that says API CONSOLE PROJECT and follow the link to the API console project for your game. In the API console, select APIs & auth, then Credentials. Notice the Javascript Origins field contains only your final URL; this also needs to contain any preview URLs to be allowed access. Click Edit settings. Under Authorized Javascript Origins, make sure the final URL and the preview URL appear on separate lines.
I did not find the " Javascript Origins field". Has the path changed ? " Under Authorized Javascript Origins...". Where I find this ?
Thanks.