This is what I am sending a post params.
I've tried with and without openid.assoc_handle field but none of them worked.
all the time it returns is_valid: false
Array( [openid.claimed_id] => https://me.yahoo.com/a/CHxd29Etm54Hzrq4_oQ_RSiba_x.k4uA#47ac6 [openid.identity] => https://me.yahoo.com/a/CHxd29Etm54Hzrq4_oQ_RSiba_x.k4uA [openid.mode] => check_authentication [openid.ns] => http://specs.openid.net/auth/2.0 [openid.op_endpoint] => https://open.login.yahooapis.com/openid/op/auth [openid.response_nonce] => 2012-04-05T07:00:39ZeouCwGETs0BAY38Iv83JgFAiLyU1T1AZBg-- [openid.return_to] => http://voxiternal.com/bong/open/verify/yahoo [openid.signed] => assoc_handle,claimed_id,identity,mode,ns,op_endpoint,response_nonce,return_to,signed,ax.value.email,ax.type.email,ax.value.language,ax.type.language,ns.ax,ax.mode,pape.auth_level.nist [openid.ax.value.email] => surajit_dam@yahoo.com [openid.ax.type.email] => http://axschema.org/contact/email [openid.ax.value.language] => en-IN [openid.ax.type.language] => http://axschema.org/pref/language [openid.ns.ax] => http://openid.net/srv/ax/1.0 [openid.ax.mode] => fetch_response [openid.pape.auth_level.nist] => 0 [openid.sig] => iHojRgJ1UnVqD4ewN/D4zQh9Qe0=)