diff --git a/lib/Config/Updater.php b/lib/Config/Updater.php
index 5b84172396..0bbc2fc254 100644
--- a/lib/Config/Updater.php
+++ b/lib/Config/Updater.php
@@ -33,8 +33,8 @@ class Updater {
 
     $latestVersion = $this->getLatestVersion();
 
-    if (isset($latestVersion->newVersion)) {
-      if (version_compare($this->version, $latestVersion->newVersion, '<')) {
+    if (isset($latestVersion->new_version)) { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+      if (version_compare($this->version, $latestVersion->new_version, '<')) { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
         $updateTransient->response[$this->plugin] = $latestVersion;
       }
       $updateTransient->lastChecked = time();
diff --git a/lib/Mailer/Methods/ErrorMappers/AmazonSESMapper.php b/lib/Mailer/Methods/ErrorMappers/AmazonSESMapper.php
index d8dbef9374..b5fed96196 100644
--- a/lib/Mailer/Methods/ErrorMappers/AmazonSESMapper.php
+++ b/lib/Mailer/Methods/ErrorMappers/AmazonSESMapper.php
@@ -29,11 +29,11 @@ class AmazonSESMapper {
    */
   public function getErrorFromResponse($response, $subscriber) {
     $message = ($response) ?
-      $response->error->Message->__toString() :
+      $response->Error->Message->__toString() : // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
       sprintf(WPFunctions::get()->__('%s has returned an unknown error.', 'mailpoet'), Mailer::METHOD_AMAZONSES);
 
     $level = MailerError::LEVEL_HARD;
-    if ($response && $response->error->Code->__toString() === 'MessageRejected') {
+    if ($response && $response->Error->Code->__toString() === 'MessageRejected') { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
       $level = MailerError::LEVEL_SOFT;
     }
     $subscriberErrors = [new SubscriberError($subscriber, null)];
diff --git a/lib/Models/ScheduledTaskSubscriber.php b/lib/Models/ScheduledTaskSubscriber.php
index bdf6b2936a..3d1311be46 100644
--- a/lib/Models/ScheduledTaskSubscriber.php
+++ b/lib/Models/ScheduledTaskSubscriber.php
@@ -23,7 +23,7 @@ class ScheduledTaskSubscriber extends Model {
   const SENDING_STATUS_UNPROCESSED = 'unprocessed';
 
   public static $_table = MP_SCHEDULED_TASK_SUBSCRIBERS_TABLE;
-  public static $idColumn = ['task_id', 'subscriber_id'];
+  public static $_id_column = ['task_id', 'subscriber_id']; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
 
   public function task() {
     return $this->hasOne(__NAMESPACE__ . '\ScheduledTask', 'id', 'task_id');
diff --git a/lib/Router/Endpoints/ViewInBrowser.php b/lib/Router/Endpoints/ViewInBrowser.php
index 8ec61960d9..10622f9fe4 100644
--- a/lib/Router/Endpoints/ViewInBrowser.php
+++ b/lib/Router/Endpoints/ViewInBrowser.php
@@ -58,19 +58,19 @@ class ViewInBrowser {
    */
   public function _validateBrowserPreviewData($data) {
     // either newsletter ID or hash must be defined, and newsletter must exist
-    if (empty($data->newsletterId) && empty($data->newsletterHash)) return false;
-    $data->newsletter = (!empty($data->newsletterHash)) ?
-      Newsletter::getByHash($data->newsletterHash) :
-      Newsletter::findOne($data->newsletterId);
+    if (empty($data->newsletter_id) && empty($data->newsletter_hash)) return false; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+    $data->newsletter = (!empty($data->newsletter_hash)) ? // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+      Newsletter::getByHash($data->newsletter_hash) : // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+      Newsletter::findOne($data->newsletter_id); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
     if (!$data->newsletter) return false;
 
     // subscriber is optional; if exists, token must validate
-    $data->subscriber = (!empty($data->subscriberId)) ?
-      Subscriber::findOne($data->subscriberId) :
+    $data->subscriber = (!empty($data->subscriber_id)) ? // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+      Subscriber::findOne($data->subscriber_id) : // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
       false;
     if ($data->subscriber) {
-      if (empty($data->subscriberToken) ||
-         !$this->linkTokens->verifyToken($data->subscriber, $data->subscriberToken)
+      if (empty($data->subscriber_token) || // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+         !$this->linkTokens->verifyToken($data->subscriber, $data->subscriber_token) // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
       ) return false;
     } else if (!$data->subscriber && !empty($data->preview)) {
       // if this is a preview and subscriber does not exist,
@@ -79,12 +79,12 @@ class ViewInBrowser {
     }
 
     // if newsletter hash is not provided but newsletter ID is defined then subscriber must exist
-    if (empty($data->newsletterHash) && $data->newsletterId && !$data->subscriber) return false;
+    if (empty($data->newsletter_hash) && $data->newsletter_id && !$data->subscriber) return false; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
 
     // queue is optional; try to find it if it's not defined and this is not a welcome email
     if ($data->newsletter->type !== Newsletter::TYPE_WELCOME) {
-      $data->queue = (!empty($data->queueId)) ?
-        SendingQueue::findOne($data->queueId) :
+      $data->queue = (!empty($data->queue_id)) ? // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
+        SendingQueue::findOne($data->queue_id) : // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
         SendingQueue::where('newsletter_id', $data->newsletter->id)
           ->findOne();
     } else {
@@ -101,7 +101,7 @@ class ViewInBrowser {
     ) return $data;
 
     // allow others to preview newsletters only when newsletter hash is defined
-    if (!empty($data->preview) && empty($data->newsletterHash)
+    if (!empty($data->preview) && empty($data->newsletter_hash) // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
     ) return false;
 
     // if queue and subscriber exist, subscriber must have received the newsletter
diff --git a/tests/integration/Router/Endpoints/ViewInBrowserTest.php b/tests/integration/Router/Endpoints/ViewInBrowserTest.php
index 15bf374784..4107f7f6a1 100644
--- a/tests/integration/Router/Endpoints/ViewInBrowserTest.php
+++ b/tests/integration/Router/Endpoints/ViewInBrowserTest.php
@@ -106,7 +106,7 @@ class ViewInBrowserTest extends \MailPoetTest {
 
   public function testItFailsValidationWhenNewsletterIdIsProvidedButSubscriberDoesNotExist() {
     $data = (object)$this->browserPreviewData;
-    $data->subscriberId = false;
+    $data->subscriber_id = false; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
     expect($this->viewInBrowser->_validateBrowserPreviewData($data))->false();
   }
 
@@ -116,10 +116,10 @@ class ViewInBrowserTest extends \MailPoetTest {
     $newsletter2->type = 'type';
     $newsletter2 = $newsletter2->save();
     $data = (object)$this->browserPreviewData;
-    $data->newsletterHash = $newsletter2->hash;
+    $data->newsletter_hash = $newsletter2->hash; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
     $result = $this->viewInBrowser->_validateBrowserPreviewData($data);
     expect($result->newsletter->id)->equals($newsletter2->id);
-    $data->newsletterHash = false;
+    $data->newsletter_hash = false; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.NotCamelCaps
     $result = $this->viewInBrowser->_validateBrowserPreviewData($data);
     expect($result->newsletter->id)->equals($newsletter1->id);
   }