ios - Get reference of facebook access token - Facebook SDK 4.X -

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i have been using facebook's login functionality link aws cognito system. link them require string of facebook's access token. prior version 4.0 used 

nsstring *facebooktoken = fbsession.activesession.accesstokendata.accesstoken;

since update no longer works. tried 

nsstring *facebooktoken = fbsdkaccesstokenchangenewkey;

but didn't work. suggestions? can't find in reference guide or sample projects.

fbsession.activesession.accesstokendata.accesstoken;

has changed to

[fbsdkaccesstoken currentaccesstoken].tokenstring

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