diff --git a/plugin/buycourses/src/buycourses.ajax.php b/plugin/buycourses/src/buycourses.ajax.php
index 936824efbe..23ac5bca7b 100644
--- a/plugin/buycourses/src/buycourses.ajax.php
+++ b/plugin/buycourses/src/buycourses.ajax.php
@@ -37,7 +37,6 @@ switch ($action) {
         }
 
         break;
-
     case 'saleInfo':
         if (api_is_anonymous()) {
             break;
@@ -75,9 +74,7 @@ switch ($action) {
         $html .= '</div>';
 
         echo $html;
-
         break;
-
     case 'stats':
         if (api_is_anonymous()) {
             break;
@@ -114,7 +111,6 @@ switch ($action) {
             $stats['canceled_total_amount'] = number_format($stats['canceled_total_amount'], 2);
         }
 
-
         $html = '<div class="row">'
         . '<p>'
             . '<ul>'
@@ -125,9 +121,7 @@ switch ($action) {
         . '</p>';
         $html .= '</div>';
         echo $html;
-
         break;
-
     case 'processPayout':
         if (api_is_anonymous()) {
             break;
@@ -141,9 +135,11 @@ switch ($action) {
         $payouts = isset($_POST['payouts']) ? $_POST['payouts'] : '';
 
         if (!$payouts) {
-
-            echo Display::return_message(get_plugin_lang("SelectOptionToProceed", "BuyCoursesPlugin"), 'error', false);
-
+            echo Display::return_message(
+                get_plugin_lang("SelectOptionToProceed", "BuyCoursesPlugin"),
+                'error',
+                false
+            );
             break;
         }
 
@@ -157,9 +153,7 @@ switch ($action) {
         }
 
         $currentCurrency = $plugin->getSelectedCurrency();
-
         $isoCode = $currentCurrency['iso_code'];
-
         $html .= '<p>'. get_plugin_lang("VerifyTotalAmountToProceedPayout", "BuyCoursesPlugin") .'</p>';
         $html .= ''
         . '<p>'
@@ -174,7 +168,6 @@ switch ($action) {
 
         echo $html;
         break;
-
     case 'proceedPayout':
         if (api_is_anonymous()) {
             break;
@@ -196,9 +189,7 @@ switch ($action) {
         $payouts = isset($_POST['payouts']) ? $_POST['payouts'] : '';
 
         if (!$payouts) {
-
             echo Display::return_message(get_plugin_lang("SelectOptionToProceed", "BuyCoursesPlugin"), 'error', false);
-
             break;
         }
 
@@ -207,23 +198,16 @@ switch ($action) {
         }
 
         $currentCurrency = $plugin->getSelectedCurrency();
-
         $isoCode = $currentCurrency['iso_code'];
-
-
         $result = MassPayment($allPayouts, $isoCode);
-
         if ($result['ACK'] === 'Success') {
             foreach ($allPayouts as $payout) {
                 $plugin->setStatusPayouts($payout['id'], BuyCoursesPlugin::PAYOUT_STATUS_COMPLETED);
             }
 
             echo Display::return_message(get_plugin_lang("PayoutSuccess", "BuyCoursesPlugin"), 'success', false);
-
         } else {
-
             echo Display::return_message('<b>'.$result['L_SEVERITYCODE0'].' '.$result['L_ERRORCODE0'].'</b> - '.$result['L_SHORTMESSAGE0'].'<br /><ul><li>'. $result['L_LONGMESSAGE0'].'</li></ul>', 'error', false);
-
         }
 
         break;
@@ -241,7 +225,6 @@ switch ($action) {
 
         break;
     case 'culqi_cargo':
-
         if (!$culqiEnable) {
             break;
         }
@@ -270,7 +253,6 @@ switch ($action) {
         $culqi = new Culqi\Culqi(array('api_key' => $SECRET_API_KEY));
 
         $environment = $culqiParams['integration'];
-
         $environment = $environment ? BuyCoursesPlugin::CULQI_INTEGRATION_TYPE : BuyCoursesPlugin::CULQI_PRODUCTION_TYPE;
 
         $culqi->setEnv($environment);
@@ -296,7 +278,6 @@ switch ($action) {
             ));
 
             if (is_object($cargo)) {
-
                 $saleIsCompleted = $plugin->completeSale($sale['id']);
 
                 if ($saleIsCompleted) {
@@ -310,15 +291,10 @@ switch ($action) {
             }
 
             echo json_encode($cargo);
-
-        } catch(Exception $e) {
-
+        } catch (Exception $e) {
             $cargo = json_decode($e->getMessage(), true);
-
             $plugin->cancelSale($sale['id']);
-
             unset($_SESSION['bc_sale_id']);
-
             if (is_array($cargo)) {
                 Display::addFlash(
                     Display::return_message(
@@ -337,11 +313,8 @@ switch ($action) {
                 );
             }
         }
-
         break;
-
     case 'culqi_cargo_service':
-
         if (!$culqiEnable) {
             break;
         }
@@ -370,11 +343,9 @@ switch ($action) {
         $culqi = new Culqi\Culqi(array('api_key' => $SECRET_API_KEY));
 
         $environment = $culqiParams['integration'];
-
         $environment = $environment ? BuyCoursesPlugin::CULQI_INTEGRATION_TYPE : BuyCoursesPlugin::CULQI_PRODUCTION_TYPE;
 
         $culqi->setEnv($environment);
-
         $user = api_get_user_info();
 
         try {
@@ -395,9 +366,7 @@ switch ($action) {
             ));
 
             if (is_object($cargo)) {
-
                 $saleIsCompleted = $plugin->completeServiceSale($serviceSale['id']);
-
                 if ($saleIsCompleted) {
                     Display::addFlash(
                         Display::return_message(
@@ -409,11 +378,8 @@ switch ($action) {
             }
 
             echo json_encode($cargo);
-
-        } catch(Exception $e) {
-
+        } catch (Exception $e) {
             $cargo = json_decode($e->getMessage(), true);
-
             $plugin->cancelServiceSale($serviceSale['id']);
 
             unset($_SESSION['bc_sale_id']);
@@ -436,22 +402,16 @@ switch ($action) {
                 );
             }
         }
-
         break;
-
     case 'service_sale_info':
-
         $id = isset($_POST['id']) ? intval($_POST['id']) : 0;
         $serviceSale = $plugin->getServiceSale($id);
-
         $isAdmin = api_is_platform_admin();
-
         if (!$serviceSale) {
             break;
         }
 
         $ajaxCallFile = $plugin->getPath('SRC') . 'buycourses.ajax.php';
-
         $serviceImg = $plugin->getPath('SERVICE_IMAGES') . $serviceSale['service']['image'];
         $html = "<img class='img-responsive text-center' src='$serviceImg'>";
         $html .= "<br />";
@@ -539,12 +499,9 @@ switch ($action) {
         $html .= "</script>";
 
         echo $html;
-
         break;
     case 'service_sale_confirm':
-
         $id = isset($_POST['id']) ? intval($_POST['id']) : 0;
-
         $serviceSale = $plugin->getServiceSale($id);
         $response = $plugin->completeServiceSale($id);
         $html = "";
@@ -566,17 +523,14 @@ switch ($action) {
         $html .= "location.reload();";
         $html .= "});";
         $html .= "</script>";
-
         echo $html;
-
         break;
     case 'service_sale_cancel':
-
         $id = isset($_POST['id']) ? intval($_POST['id']) : 0;
 
         $serviceSale = $plugin->getServiceSale($id);
         $response = $plugin->cancelServiceSale($id);
-        $html = "";
+        $html = '';
         $html .= "<div class='text-center'>";
 
         if ($response) {
@@ -595,8 +549,6 @@ switch ($action) {
         $html .= "location.reload();";
         $html .= "});";
         $html .= "</script>";
-
         echo $html;
-
         break;
 }
diff --git a/plugin/buycourses/src/configure_course.php b/plugin/buycourses/src/configure_course.php
index 04a6c25b15..16fca99a3a 100644
--- a/plugin/buycourses/src/configure_course.php
+++ b/plugin/buycourses/src/configure_course.php
@@ -1,12 +1,11 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Configuration script for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Initialization
- */
+
 $cidReset = true;
 
 require_once '../config.php';
@@ -219,7 +218,7 @@ if ($editingCourse) {
 
 if ($commissionsEnable === 'true') {
     $platformCommission = $plugin->getPlatformCommission();
-    $form->addHtml( ''
+    $form->addHtml(''
             . '<div class="form-group">'
                 . '<label for="sliders" class="col-sm-2 control-label">'
                     . get_plugin_lang('Commissions', 'BuyCoursesPlugin')
diff --git a/plugin/buycourses/src/course_catalog.php b/plugin/buycourses/src/course_catalog.php
index 67a7149c51..cc5c2de967 100644
--- a/plugin/buycourses/src/course_catalog.php
+++ b/plugin/buycourses/src/course_catalog.php
@@ -1,4 +1,6 @@
 <?php
+/* For license terms, see /license.txt */
+
 /**
  * List of courses
  * @package chamilo.plugin.buycourses
diff --git a/plugin/buycourses/src/course_panel.php b/plugin/buycourses/src/course_panel.php
index 4695646364..b2635f37d9 100644
--- a/plugin/buycourses/src/course_panel.php
+++ b/plugin/buycourses/src/course_panel.php
@@ -1,4 +1,5 @@
 <?php
+/* For license terms, see /license.txt */
 /**
  * User Panel
  * @package chamilo.plugin.buycourses
diff --git a/plugin/buycourses/src/error.php b/plugin/buycourses/src/error.php
index 0b4d2349f1..4db0411ff7 100644
--- a/plugin/buycourses/src/error.php
+++ b/plugin/buycourses/src/error.php
@@ -10,3 +10,4 @@
 unset($_SESSION['bc_sale_id']);
 
 header('Location: course_catalog.php');
+exit;
diff --git a/plugin/buycourses/src/process.php b/plugin/buycourses/src/process.php
index 44ab22829c..8a3e02b4a5 100644
--- a/plugin/buycourses/src/process.php
+++ b/plugin/buycourses/src/process.php
@@ -1,12 +1,10 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Process payments for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Initialization
- */
 require_once '../config.php';
 
 $currentUserId = api_get_user_id();
@@ -48,7 +46,7 @@ $form = new FormValidator('confirm_sale');
 
 if ($form->validate()) {
     $formValues = $form->getSubmitValues();
-    
+
     if (!$formValues['payment_type']) {
         Display::addFlash(
             Display::return_message($plugin->get_lang('NeedToSelectPaymentType'), 'error', false)
@@ -56,12 +54,12 @@ if ($form->validate()) {
         header('Location:' . api_get_self() . '?' . $queryString);
         exit;
     }
-    
+
     $saleId = $plugin->registerSale($item['id'], $formValues['payment_type']);
 
     if ($saleId !== false) {
         $_SESSION['bc_sale_id'] = $saleId;
-        header('Location: ' . api_get_path(WEB_PLUGIN_PATH) . 'buycourses/src/process_confirm.php');  
+        header('Location: ' . api_get_path(WEB_PLUGIN_PATH) . 'buycourses/src/process_confirm.php');
     }
 
     exit;
diff --git a/plugin/buycourses/src/process_confirm.php b/plugin/buycourses/src/process_confirm.php
index 231da4954b..977d9fc1da 100644
--- a/plugin/buycourses/src/process_confirm.php
+++ b/plugin/buycourses/src/process_confirm.php
@@ -1,12 +1,10 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Process purchase confirmation script for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Init
- */
 require_once '../config.php';
 
 $plugin = BuyCoursesPlugin::create();
diff --git a/plugin/buycourses/src/service_process_confirm.php b/plugin/buycourses/src/service_process_confirm.php
index 00445aa066..05f3f84e70 100644
--- a/plugin/buycourses/src/service_process_confirm.php
+++ b/plugin/buycourses/src/service_process_confirm.php
@@ -1,12 +1,11 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Process purchase confirmation script for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Init
- */
+
 require_once '../config.php';
 
 $plugin = BuyCoursesPlugin::create();
diff --git a/plugin/buycourses/src/service_sales_report.php b/plugin/buycourses/src/service_sales_report.php
index f78a417ad8..bd22b607cb 100644
--- a/plugin/buycourses/src/service_sales_report.php
+++ b/plugin/buycourses/src/service_sales_report.php
@@ -5,7 +5,7 @@
  * List of pending payments of the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-//Initialization
+
 $cidReset = true;
 
 require_once '../config.php';
diff --git a/plugin/buycourses/src/service_success.php b/plugin/buycourses/src/service_success.php
index de8ba4aada..912e8fbdb1 100644
--- a/plugin/buycourses/src/service_success.php
+++ b/plugin/buycourses/src/service_success.php
@@ -1,12 +1,10 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Success page for the purchase of a service in the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Init
- */
 require_once '../config.php';
 
 $plugin = BuyCoursesPlugin::create();
diff --git a/plugin/buycourses/src/services_add.php b/plugin/buycourses/src/services_add.php
index d3051886dd..c6d8df5047 100644
--- a/plugin/buycourses/src/services_add.php
+++ b/plugin/buycourses/src/services_add.php
@@ -1,12 +1,10 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Create new Services for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Init
- */
 
 $cidReset = true;
 
@@ -111,13 +109,13 @@ $form->setDefaults($formDefaultValues);
 
 if ($form->validate()) {
     $values = $form->getSubmitValues();
-    
+
     $plugin->storeService($values);
 
     Display::addFlash(
         Display::return_message($plugin->get_lang('ServiceAdded'), 'success')
     );
-    
+
     header('Location: configuration.php');
     exit;
 }
diff --git a/plugin/buycourses/src/services_edit.php b/plugin/buycourses/src/services_edit.php
index 302d497078..b148db47d1 100644
--- a/plugin/buycourses/src/services_edit.php
+++ b/plugin/buycourses/src/services_edit.php
@@ -1,12 +1,10 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Create new Services for the Buy Courses plugin
  * @package chamilo.plugin.buycourses
  */
-/**
- * Init
- */
 
 $cidReset = true;
 
diff --git a/plugin/buycourses/src/session_catalog.php b/plugin/buycourses/src/session_catalog.php
index 85138846f1..d2522a29a8 100644
--- a/plugin/buycourses/src/session_catalog.php
+++ b/plugin/buycourses/src/session_catalog.php
@@ -1,11 +1,11 @@
 <?php
+/* For license terms, see /license.txt */
+
 /**
  * List of courses
  * @package chamilo.plugin.buycourses
  */
-/**
- * Initialization
- */
+
 $cidReset = true;
 
 require_once __DIR__.'/../../../main/inc/global.inc.php';
@@ -22,7 +22,14 @@ $nameFilter = null;
 $minFilter = 0;
 $maxFilter = 0;
 
-$form = new FormValidator('search_filter_form', 'get', null, null, [], FormValidator::LAYOUT_INLINE);
+$form = new FormValidator(
+    'search_filter_form',
+    'get',
+    null,
+    null,
+    [],
+    FormValidator::LAYOUT_INLINE
+);
 
 if ($form->validate()) {
     $formValues = $form->getSubmitValues();
diff --git a/plugin/buycourses/src/session_panel.php b/plugin/buycourses/src/session_panel.php
index 8f36570217..c6c896358d 100644
--- a/plugin/buycourses/src/session_panel.php
+++ b/plugin/buycourses/src/session_panel.php
@@ -1,11 +1,10 @@
 <?php
+/* For license terms, see /license.txt */
+
 /**
  * User Panel
  * @package chamilo.plugin.buycourses
  */
-/**
- * Initialization
- */
 
 $cidReset = true;
 
diff --git a/plugin/buycourses/src/success.php b/plugin/buycourses/src/success.php
index 93993083c3..3b276312f4 100644
--- a/plugin/buycourses/src/success.php
+++ b/plugin/buycourses/src/success.php
@@ -1,5 +1,6 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * Success page for the purchase of a course in the Buy Courses plugin
  * @package chamilo.plugin.buycourses
diff --git a/plugin/buycourses/uninstall.php b/plugin/buycourses/uninstall.php
index 8af5e67969..faea760796 100644
--- a/plugin/buycourses/uninstall.php
+++ b/plugin/buycourses/uninstall.php
@@ -1,5 +1,6 @@
 <?php
 /* For license terms, see /license.txt */
+
 /**
  * This script is included by main/admin/settings.lib.php when unselecting a plugin
  * and is meant to remove things installed by the install.php script in both