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How to Authenticate OSM users against OSM user database?

1	I am developing a webapp with OpenLayers and php for editing in osm and I need to find if a user is registered for OSM. How can i do that? login php editing registration asked 12 Mar '13, 06:18 amritkarma 684●21●29●41 accept rate: 11%

One Answer:

4	Check this wiki page: https://wiki.openstreetmap.org/wiki/OAuth answered 12 Mar '13, 09:28 Pieren 9.8k●20●83●157 accept rate: 15%