diff --git a/.github/workflows/Lint.yml b/.github/workflows/Lint.yml
index 490e47b2..ca0ae8d0 100644
--- a/.github/workflows/Lint.yml
+++ b/.github/workflows/Lint.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: ['7.4', '8.0', '8.1', '8.2']
+        php: ['7.4', '8.0', '8.1', '8.2', '8.3']
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/upload/admin/controller/extension/payment/pp_express.php b/upload/admin/controller/extension/payment/pp_express.php
index 99e87af1..8708acb7 100644
--- a/upload/admin/controller/extension/payment/pp_express.php
+++ b/upload/admin/controller/extension/payment/pp_express.php
@@ -847,7 +847,6 @@ public function recurringCancel() {
 				'SIGNATURE'    => $api_signature,
 				'VERSION'      => '109.0',
 				'BUTTONSOURCE' => 'OpenCart_2.0_EC',
-				'METHOD'       => 'SetExpressCheckout',
 				'METHOD'       => 'ManageRecurringPaymentsProfileStatus',
 				'PROFILEID'    => $recurring_info['reference'],
 				'ACTION'       => 'Cancel'
diff --git a/upload/admin/model/extension/payment/sagepay_direct.php b/upload/admin/model/extension/payment/sagepay_direct.php
index 5c0c944e..a1bd7113 100644
--- a/upload/admin/model/extension/payment/sagepay_direct.php
+++ b/upload/admin/model/extension/payment/sagepay_direct.php
@@ -244,7 +244,7 @@ public function sendCurl($url, $payment_data) {
 
 		$response_info = explode(chr(10), $response);
 
-		foreach ($response_info as $string) {
+		foreach ($response_info as $i => $string) {
 			if (strpos($string, '=') && isset($i)) {
 				$parts = explode('=', $string, 2);
 				$data['RepeatResponseData_' . $i][trim($parts[0])] = trim($parts[1]);
diff --git a/upload/admin/model/extension/payment/sagepay_server.php b/upload/admin/model/extension/payment/sagepay_server.php
index a72ac0dd..3546a3f5 100644
--- a/upload/admin/model/extension/payment/sagepay_server.php
+++ b/upload/admin/model/extension/payment/sagepay_server.php
@@ -245,7 +245,7 @@ public function sendCurl($url, $payment_data) {
 
 		$response_info = explode(chr(10), $response);
 
-		foreach ($response_info as $string) {
+		foreach ($response_info as $i => $string) {
 			if (strpos($string, '=') && isset($i)) {
 				$parts = explode('=', $string, 2);
 				$data['RepeatResponseData_' . $i][trim($parts[0])] = trim($parts[1]);
@@ -263,4 +263,4 @@ public function logger($title, $data) {
 			$log->write($title . ': ' . print_r($data, 1));
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/upload/admin/model/sale/recurring.php b/upload/admin/model/sale/recurring.php
index 62786248..6b1dc4c8 100644
--- a/upload/admin/model/sale/recurring.php
+++ b/upload/admin/model/sale/recurring.php
@@ -163,27 +163,27 @@ public function getTotalRecurrings($data) {
 		$implode = array();
 
 		if (!empty($data['filter_order_recurring_id'])) {
-			$implode[] .= "or.order_recurring_id = " . (int)$data['filter_order_recurring_id'];
+			$implode[] = "or.order_recurring_id = " . (int)$data['filter_order_recurring_id'];
 		}
 
 		if (!empty($data['filter_order_id'])) {
-			$implode[] .= "or.order_id = " . (int)$data['filter_order_id'];
+			$implode[] = "or.order_id = " . (int)$data['filter_order_id'];
 		}
 
 		if (!empty($data['filter_payment_reference'])) {
-			$implode[] .= " or.reference LIKE '" . $this->db->escape($data['filter_reference']) . "%'";
+			$implode[] = " or.reference LIKE '" . $this->db->escape($data['filter_reference']) . "%'";
 		}
 
 		if (!empty($data['filter_customer'])) {
-			$implode[] .= "CONCAT(o.firstname, ' ', o.lastname) LIKE '" . $this->db->escape($data['filter_customer']) . "%'";
+			$implode[] = "CONCAT(o.firstname, ' ', o.lastname) LIKE '" . $this->db->escape($data['filter_customer']) . "%'";
 		}
 
 		if (!empty($data['filter_status'])) {
-			$implode[] .= "or.status = " . (int)$data['filter_status'];
+			$implode[] = "or.status = " . (int)$data['filter_status'];
 		}
 
 		if (!empty($data['filter_date_added'])) {
-			$implode[] .= "DATE(or.date_added) = DATE('" . $this->db->escape($data['filter_date_added']) . "')";
+			$implode[] = "DATE(or.date_added) = DATE('" . $this->db->escape($data['filter_date_added']) . "')";
 		}
 		
 		if ($implode) {
@@ -194,4 +194,4 @@ public function getTotalRecurrings($data) {
 
 		return (int)$query->row['total'];
 	}	
-}
\ No newline at end of file
+}
diff --git a/upload/catalog/controller/extension/recurring/pp_express.php b/upload/catalog/controller/extension/recurring/pp_express.php
index 5bf66a15..d50c5509 100644
--- a/upload/catalog/controller/extension/recurring/pp_express.php
+++ b/upload/catalog/controller/extension/recurring/pp_express.php
@@ -66,7 +66,6 @@ public function cancel() {
 				'SIGNATURE'    => $api_signature,
 				'VERSION'      => '109.0',
 				'BUTTONSOURCE' => 'OpenCart_2.0_EC',
-				'METHOD'       => 'SetExpressCheckout',
 				'METHOD'       => 'ManageRecurringPaymentsProfileStatus',
 				'PROFILEID'    => $recurring_info['reference'],
 				'ACTION'       => 'Cancel'
@@ -108,4 +107,4 @@ public function cancel() {
 		$this->response->addHeader('Content-Type: application/json');
 		$this->response->setOutput(json_encode($json));
 	}	
-}
\ No newline at end of file
+}
diff --git a/upload/install/model/3rd_party/maxmind.php b/upload/install/model/3rd_party/maxmind.php
index 0355df31..d3d5b024 100644
--- a/upload/install/model/3rd_party/maxmind.php
+++ b/upload/install/model/3rd_party/maxmind.php
@@ -1,7 +1,7 @@
 <?php
 class Model3rdPartyMaxmind extends Model {
 	public function editSetting($data) {
-		$this->db->query("REPLACE INTO `" . DB_PREFIX . "setting` SET `maxmind_key` = '" . $db->escape($data['maxmind_key']) . "', `maxmind_score` = '" . (int)$data['maxmind_score'] . "', `maxmind_order_status_id` = '" . (int)$data['maxmind_order_status_id'] . "' WHERE `store_id` = '0' AND `code` = 'maxmind'");
+		$this->db->query("REPLACE INTO `" . DB_PREFIX . "setting` SET `maxmind_key` = '" . $this->db->escape($data['maxmind_key']) . "', `maxmind_score` = '" . (int)$data['maxmind_score'] . "', `maxmind_order_status_id` = '" . (int)$data['maxmind_order_status_id'] . "' WHERE `store_id` = '0' AND `code` = 'maxmind'");
 
 		$this->db->query("INSERT INTO `oc_extension` (`type`, `code`) VALUES ('fraud', 'maxmind')");
 	}
diff --git a/upload/system/config/paypal.php b/upload/system/config/paypal.php
index 5c87421b..7d3dca92 100644
--- a/upload/system/config/paypal.php
+++ b/upload/system/config/paypal.php
@@ -593,10 +593,6 @@
 			'code' => 'bancontact',
 			'name' => 'text_bancontact'
 		),
-		'bancontact' => array(
-			'code' => 'bancontact',
-			'name' => 'text_bancontact'
-		),
 		'blik' => array(
 			'code' => 'blik',
 			'name' => 'text_blik'
@@ -1017,4 +1013,3 @@
 		),
 	)
 );
-?>
\ No newline at end of file
diff --git a/upload/system/helper/utf8.php b/upload/system/helper/utf8.php
index 041fe624..6109ea02 100644
--- a/upload/system/helper/utf8.php
+++ b/upload/system/helper/utf8.php
@@ -188,8 +188,6 @@ function utf8_strtolower($string) {
 				0x040C => 0x045C,
 				0x041F => 0x043F,
 				0x042C => 0x044C,
-				0x00DE => 0x00FE,
-				0x00D0 => 0x00F0,
 				0x1EF2 => 0x1EF3,
 				0x0048 => 0x0068,
 				0x00CB => 0x00EB,
@@ -248,7 +246,6 @@ function utf8_strtolower($string) {
 				0x0106 => 0x0107,
 				0x03AB => 0x03CB,
 				0x0426 => 0x0446,
-				0x00DE => 0x00FE,
 				0x00C7 => 0x00E7,
 				0x03AA => 0x03CA,
 				0x0421 => 0x0441,
@@ -262,13 +259,10 @@ function utf8_strtolower($string) {
 				0x040B => 0x045B,
 				0x0406 => 0x0456,
 				0x0102 => 0x0103,
-				0x039B => 0x03BB,
 				0x00D1 => 0x00F1,
 				0x041D => 0x043D,
 				0x038C => 0x03CC,
 				0x00C9 => 0x00E9,
-				0x00D0 => 0x00F0,
-				0x0407 => 0x0457,
 				0x0122 => 0x0123
 			);
 		}
@@ -424,8 +418,6 @@ function utf8_strtoupper($string) {
 				0x045C => 0x040C,
 				0x043F => 0x041F,
 				0x044C => 0x042C,
-				0x00FE => 0x00DE,
-				0x00F0 => 0x00D0,
 				0x1EF3 => 0x1EF2,
 				0x0068 => 0x0048,
 				0x00EB => 0x00CB,
@@ -484,7 +476,6 @@ function utf8_strtoupper($string) {
 				0x0107 => 0x0106,
 				0x03CB => 0x03AB,
 				0x0446 => 0x0426,
-				0x00FE => 0x00DE,
 				0x00E7 => 0x00C7,
 				0x03CA => 0x03AA,
 				0x0441 => 0x0421,
@@ -498,13 +489,10 @@ function utf8_strtoupper($string) {
 				0x045B => 0x040B,
 				0x0456 => 0x0406,
 				0x0103 => 0x0102,
-				0x03BB => 0x039B,
 				0x00F1 => 0x00D1,
 				0x043D => 0x041D,
 				0x03CC => 0x038C,
 				0x00E9 => 0x00C9,
-				0x00F0 => 0x00D0,
-				0x0457 => 0x0407,
 				0x0123 => 0x0122
 			);
 		}
diff --git a/upload/system/library/session.php b/upload/system/library/session.php
index 59b86fe1..398e1f31 100644
--- a/upload/system/library/session.php
+++ b/upload/system/library/session.php
@@ -2,6 +2,7 @@
 class Session {
 	public $session_id = '';
 	public $data = array();
+	public $adaptor;
 
 	public function __construct($adaptor = 'native') {
 		$class = 'Session\\' . $adaptor;
@@ -74,4 +75,4 @@ public function destroy($key = 'default') {
 
 		setcookie($key, '', time() - 42000, ini_get('session.cookie_path'), ini_get('session.cookie_domain'));
 	}
-}
\ No newline at end of file
+}
diff --git a/upload/system/library/session/file.php b/upload/system/library/session/file.php
index 6f6fdd27..2fb8b793 100644
--- a/upload/system/library/session/file.php
+++ b/upload/system/library/session/file.php
@@ -1,18 +1,17 @@
 <?php
 namespace Session;
 class File extends \SessionHandler {
-    public function create_sid() {
-        return parent::create_sid();
-    }
-
+    #[\ReturnTypeWillChange]
     public function open($path, $name) {
         return true;
     }
 
+    #[\ReturnTypeWillChange]
     public function close() {
         return true;
     }
 	
+    #[\ReturnTypeWillChange]
     public function read($session_id) {
 		$file = session_save_path() . '/sess_' . $session_id;
 		
@@ -33,6 +32,7 @@ public function read($session_id) {
 		return null;
 	}
 
+    #[\ReturnTypeWillChange]
     public function write($session_id, $data) {
 		$file = session_save_path() . '/sess_' . $session_id;
 		
@@ -51,6 +51,7 @@ public function write($session_id, $data) {
 		return true;
     }
 
+    #[\ReturnTypeWillChange]
     public function destroy($session_id) {
 		$file = session_save_path() . '/sess_' . $session_id;
 		
@@ -58,8 +59,4 @@ public function destroy($session_id) {
 			unlink($file);
 		}
     }
-
-    public function gc($maxlifetime) {
-        return parent::gc($maxlifetime);
-    }	
 }
diff --git a/upload/system/library/session/native.php b/upload/system/library/session/native.php
index acdd1d73..6962f06e 100644
--- a/upload/system/library/session/native.php
+++ b/upload/system/library/session/native.php
@@ -1,31 +1,4 @@
 <?php
 namespace Session;
 class Native extends \SessionHandler {
-    public function create_sid() {
-        return parent::create_sid();
-    }
-
-    public function open($path, $name) {
-        return parent::open($path, $name);
-    }
-
-    public function close() {
-        return parent::close();
-    }
-	
-    public function read($session_id) {
-        return parent::read($session_id);
-    }
-
-    public function write($session_id, $data) {
-		return parent::write($session_id, $data);
-    }
-
-    public function destroy($session_id) {
-        return parent::destroy($session_id);
-    }
-
-    public function gc($maxlifetime) {
-        return parent::gc($maxlifetime);
-    }	
-}
\ No newline at end of file
+}