OAuth 2- Legged Authentication To DRopbox Account

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SharePoint2010

Hi,
i have requirement to get the dropbox(http://www.dropbox.com) data into sharepoint2010 webpart i need to perform CRUD operation from web part. for this requirement what dropbox developer blog provide i need to first authenticate the dropbox account using Oauth 3- legged Authentication approch but this approch i need to build one url where user needs to login his dropbox account for authentication process, but this approch is not recommnaded by my technical people ,that i need to perform authentication without user interaction to dropbox account. you have developed one approach looks like what i am exactly require can you provide any info realted to this
i need to get oauth accesstoken after successful user authentication

what i have is

API key
ApI secrest
url :http://api.dropbox.com this content url