These options only apply to the Users API 
<> in Google 
Apps. Selecting 'Google Apps Domain' will restrict login to users from a 
specific Google Apps domain only, while 'Google Accounts API' allows 
from any Google account.

Note that the newest version of Google Identity Toolkit has been released 
as Firebase Authentication <>, so 
it's recommended to use this for new projects.

On Sunday, September 18, 2016 at 10:27:08 PM UTC-4, channing dev wrote:
> Hi,
> I see. But which one will be selected (Google Accounts API or Google Apps 
> Domain) even I use the Google Identity Toolkit for federated login.
> Thanks
> On Monday, September 19, 2016 at 8:02:10 AM UTC+8, Adam (Cloud Platform 
> Support) wrote:
>> That option has been deprecated for some time 
>> <>
>> (the only references to that option are from blog and forum posts for 4+ 
>> years ago). You don't need that option for federated sign-in anymore 
>> though, as this functionality is now provided by Open ID Connect via the 
>> Google Identity Toolkit 
>> <>.
>> On Saturday, September 17, 2016 at 11:32:07 PM UTC-4, channing dev wrote:
>>> Hello,
>>> Why I can't see the "Experimental Federated Login" option in App Engine 
>>> Settings on my GAE projects?
>>> <>
>>> Thanks a lot.

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