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```objc+ (void)requestAccessTokenForCode:(NSString *)accessCode clientId:(NSString *)clientID callbackURIString:(NSString *)callbackURIString clientSecret:(NSString *)clientSecret completionBlock:(FSTokenRequestCompletionBlock)completionBlock;```This method will initiate an asynchronous network request to Foursquare to convert a user's access code into an auth token.*WARNING:* For security reasons, it is recommended that you not use this method if possible. You should pass the returned accessCode to your own server and have it contact the Foursquare server to [convert the code to an access token](https://developer.foursquare.com/overview/auth