OJSPaymentManager::purchaseArticleEnabled PHP Method

    function purchaseArticleEnabled()
    {
        $journal = $this->request->getJournal();
        return $this->isConfigured() && $journal->getSetting('purchaseArticleFeeEnabled') && $journal->getSetting('purchaseArticleFee') > 0;
    }

 /**
  * Given an issue, set up the template with all the required variables for
  * issues/view.tpl to function properly (i.e. current issue and view issue).
  * @param $issue object The issue to display
  * @param $showToc boolean iff false and a custom cover page exists,
  * 	the cover page will be displayed. Otherwise table of contents
  * 	will be displayed.
  */
 function _setupIssueTemplate($request, $issue, $showToc = false)
 {
     $journal =& $request->getJournal();
     $journalId = $journal->getId();
     $templateMgr =& TemplateManager::getManager();
     if (IssueHandler::_isVisibleIssue($issue, $journalId)) {
         $issueHeadingTitle = $issue->getIssueIdentification(false, true);
         $issueCrumbTitle = $issue->getIssueIdentification(false, true);
         $locale = AppLocale::getLocale();
         import('classes.file.PublicFileManager');
         $publicFileManager = new PublicFileManager();
         $coverPagePath = $request->getBaseUrl() . '/';
         $coverPagePath .= $publicFileManager->getJournalFilesPath($journalId) . '/';
         $templateMgr->assign('coverPagePath', $coverPagePath);
         $templateMgr->assign('locale', $locale);
         $coverLocale = $issue->getFileName($locale) ? $locale : $journal->getPrimaryLocale();
         if (!$showToc && $issue->getFileName($coverLocale) && $issue->getShowCoverPage($coverLocale) && !$issue->getHideCoverPageCover($coverLocale)) {
             $templateMgr->assign('fileName', $issue->getFileName($coverLocale));
             $templateMgr->assign('width', $issue->getWidth($coverLocale));
             $templateMgr->assign('height', $issue->getHeight($coverLocale));
             $templateMgr->assign('coverPageAltText', $issue->getCoverPageAltText($coverLocale));
             $templateMgr->assign('originalFileName', $issue->getOriginalFileName($coverLocale));
             $showToc = false;
         } else {
             // Issue galleys
             $issueGalleyDao =& DAORegistry::getDAO('IssueGalleyDAO');
             $issueGalleys =& $issueGalleyDao->getGalleysByIssue($issue->getId());
             $templateMgr->assign_by_ref('issueGalleys', $issueGalleys);
             // Published articles
             $publishedArticleDao =& DAORegistry::getDAO('PublishedArticleDAO');
             $publishedArticles =& $publishedArticleDao->getPublishedArticlesInSections($issue->getId(), true);
             $publicFileManager = new PublicFileManager();
             $templateMgr->assign_by_ref('publishedArticles', $publishedArticles);
             $showToc = true;
         }
         $templateMgr->assign('showToc', $showToc);
         $templateMgr->assign_by_ref('issue', $issue);
         // Subscription Access
         import('classes.issue.IssueAction');
         $subscriptionRequired = IssueAction::subscriptionRequired($issue);
         $subscribedUser = IssueAction::subscribedUser($journal);
         $subscribedDomain = IssueAction::subscribedDomain($journal);
         $subscriptionExpiryPartial = $journal->getSetting('subscriptionExpiryPartial');
         if ($showToc && $subscriptionRequired && !$subscribedUser && !$subscribedDomain && $subscriptionExpiryPartial) {
             $templateMgr->assign('subscriptionExpiryPartial', true);
             // Partial subscription expiry for issue
             $partial = IssueAction::subscribedUser($journal, $issue->getId());
             if (!$partial) {
                 IssueAction::subscribedDomain($journal, $issue->getId());
             }
             $templateMgr->assign('issueExpiryPartial', $partial);
             // Partial subscription expiry for articles
             $publishedArticleDao =& DAORegistry::getDAO('PublishedArticleDAO');
             $publishedArticlesTemp =& $publishedArticleDao->getPublishedArticles($issue->getId());
             $articleExpiryPartial = array();
             foreach ($publishedArticlesTemp as $publishedArticle) {
                 $partial = IssueAction::subscribedUser($journal, $issue->getId(), $publishedArticle->getId());
                 if (!$partial) {
                     IssueAction::subscribedDomain($journal, $issue->getId(), $publishedArticle->getId());
                 }
                 $articleExpiryPartial[$publishedArticle->getId()] = $partial;
             }
             $templateMgr->assign_by_ref('articleExpiryPartial', $articleExpiryPartial);
         }
         $templateMgr->assign('subscriptionRequired', $subscriptionRequired);
         $templateMgr->assign('subscribedUser', $subscribedUser);
         $templateMgr->assign('subscribedDomain', $subscribedDomain);
         $templateMgr->assign('showGalleyLinks', $journal->getSetting('showGalleyLinks'));
         import('classes.payment.ojs.OJSPaymentManager');
         $paymentManager = new OJSPaymentManager($request);
         if ($paymentManager->onlyPdfEnabled()) {
             $templateMgr->assign('restrictOnlyPdf', true);
         }
         if ($paymentManager->purchaseArticleEnabled()) {
             $templateMgr->assign('purchaseArticleEnabled', true);
         }
     } else {
         $issueCrumbTitle = __('archive.issueUnavailable');
         $issueHeadingTitle = __('archive.issueUnavailable');
     }
     if ($issue && ($styleFileName = $issue->getStyleFileName())) {
         import('classes.file.PublicFileManager');
         $publicFileManager = new PublicFileManager();
         $templateMgr->addStyleSheet($request->getBaseUrl() . '/' . $publicFileManager->getJournalFilesPath($journalId) . '/' . $styleFileName);
     }
     $templateMgr->assign('pageCrumbTitleTranslated', $issueCrumbTitle);
     $templateMgr->assign('issueHeadingTitle', $issueHeadingTitle);
 }