BuyCourses: Fix back button when processing sale - refs BT#17957

plugin/buycourses/src/process.php

@@ -120,6 +120,7 @@ $templateName = $plugin->get_lang('PaymentMethods');
 $interbreadcrumb[] = ['url' => 'course_catalog.php', 'name' => $plugin->get_lang('CourseListOnSale')];
 
 $tpl = new Template($templateName);
+$tpl->assign('item_type', (int) $_GET['t']);
 $tpl->assign('buying_course', $buyingCourse);
 $tpl->assign('buying_session', $buyingSession);
 $tpl->assign('user', api_get_user_info());

plugin/buycourses/view/process.tpl

@@ -1,5 +1,13 @@
 <div class="actions">
-    <a href="{{ _p.web }}main/auth/courses.php" title="{{ "Back"|get_lang }}">
+    {% if item_type == 1 %}
+        {% set back_url = _p.web_plugin ~ 'buycourses/src/course_catalog.php' %}
+    {% elseif item_type == 2 %}
+        {% set back_url = _p.web_plugin ~ 'buycourses/src/session_catalog.php' %}
+    {% else %}
+        {% set back_url = _p.web_plugin ~ 'buycourses/src/service_catalog.php' %}
+    {% endif %}
+
+    <a href="{{ back_url }}" title="{{ "Back"|get_lang }}">
         <img src="{{ "back.png"|icon(32) }}" width="32" height="32" alt="{{ "Back"|get_lang }}"
              title="{{ "Back"|get_lang }}"/>
     </a>