I want to login a community user using rest api.
I already have the access_token, but how do I proceed?
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There have been a couple of articles directly related to this. They mostly speak to Portals, but it's the same procedure for Communities. The article that really got this off the ground for me was published by Pat Patterson (@metadaddy) in 2013. One of the important points is that you must use a DE org or Production for this to work... something about certificates in Sandboxes. The other important takeaway is the login URL. It's got to point to your site like
The second article is in the Mobile SDK Development Guide. Again it's talking about Portal, but works with Community Users too.