original_string: protected function fetchRequestToken()
      {
          // Fetching a new request token. Remove any old access tokens.
          $this->storage->delete(static::BIB_ACCESS_TOKEN);
          // Fetch a request token.
          $token = $this->consumer->getRequestToken();
          // Persist the token to storage.
          $this->storage->set(static::BIB_REQUEST_TOKEN, $token);
  
          return $this;
      }
code: protected function fetchRequestToken()
      {
          // Fetching a new request token. Remove any old access tokens.
          $this->storage->delete(static::BIB_ACCESS_TOKEN);
          // Fetch a request token.
          $token = $this->consumer->getRequestToken();
          // Persist the token to storage.
          $this->storage->set(static::BIB_REQUEST_TOKEN, $token);
  
          return $this;
      }
code_tokens: protected function fetchRequestToken ( ) { // Fetching a new request token. Remove any old access tokens. $ this -> storage -> delete ( static :: BIB_ACCESS_TOKEN ) ; // Fetch a request token. $ token = $ this -> consumer -> getRequestToken ( ) ; // Persist the token to storage. $ this -> storage -> set ( static :: BIB_REQUEST_TOKEN , $ token ) ; return $ this ; }
docstring: Fetches the request token.
  
  @return $this
docstring_tokens: Fetches the request token .