mapdev\FacebookMessenger\Callback\EntryMessage::updateAccountLinking PHP Method

    private function updateAccountLinking()
    {
        $this->isAccountLinking = !is_null(Helper::array_find($this->_message, 'account_linking'));
        if ($this->isAccountLinking) {
            $this->account_linking = new AccountLinking(Helper::array_find($this->_message, 'account_linking'));
        }
    }