Newscoop\Subscription\SubscriptionData::addIssue PHP Method

    public function addIssue(IssueEntity $issue, $language)
    {
        $issue = new \Newscoop\Subscription\Issue($this->subscription, $issue);
        $issue->setStartDate($this->startDate);
        $issue->setDays($this->days);
        $issue->setPaidDays($this->paidDays);
        $issue->setLanguage($language);
        $this->issues[$issue->getIssueNumber()] = $issue;
    }