diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..94f480d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto eol=lf
\ No newline at end of file
diff --git a/.github/workflows/phpcs.yaml b/.github/workflows/phpcs.yaml
new file mode 100644
index 0000000..4e3c48e
--- /dev/null
+++ b/.github/workflows/phpcs.yaml
@@ -0,0 +1,34 @@
+name: PHPCS Check
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  phpcs:
+    name: PHPCS Check
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.1'
+
+      - name: Install PHPCS
+        run: |
+          composer config --global --no-plugins allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
+          composer require --dev squizlabs/php_codesniffer=* slevomat/coding-standard
+
+      - name: Run PHPCS
+        run: |
+          composer phpcs --standard=phpcs.xml .
+          exit_status=$?
+          if [ $exit_status -ne 0 ]; then
+            echo "PHPCS check failed. Please fix the issues before merging."
+            exit 1
+          fi
\ No newline at end of file
diff --git a/app/DonateBox/DonateBox.php b/app/DonateBox/DonateBox.php
index 7a5416e..2df1205 100644
--- a/app/DonateBox/DonateBox.php
+++ b/app/DonateBox/DonateBox.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation\DonateBox;
 
-use \BeycanPress\CryptoPay\Services;
-use \BeycanPress\CryptoPay\Donation\Lang;
-use \BeycanPress\CryptoPay\PluginHero\Hook;
-use \BeycanPress\CryptoPay\PluginHero\Helpers;
+use BeycanPress\CryptoPay\Services;
+use BeycanPress\CryptoPay\Donation\Lang;
+use BeycanPress\CryptoPay\PluginHero\Hook;
+use BeycanPress\CryptoPay\PluginHero\Helpers;
 
 class DonateBox
 {
@@ -14,31 +16,37 @@ class DonateBox
     /**
      * @var string
      */
-    private $receiver;
+    private string $receiver;
 
+    /**
+     * @return void
+     */
     public function __construct()
     {
-        add_action('init', function() {
+        add_action('init', function (): void {
             add_shortcode('cryptopay-donation-box', array($this, 'init'));
         });
     }
 
-    public function init()
+    /**
+     * @return string
+     */
+    public function init(): string
     {
-        Hook::addFilter('lang', function($lang) {
+        Hook::addFilter('lang', function ($lang) {
             return array_merge($lang, Lang::get());
         });
 
-        $this->addons->donation->addScript('main.js');
-        $this->addons->donation->addStyle('main.css');
+        Helpers::getAddon('donation')->addScript('main.js');
+        Helpers::getAddon('donation')->addStyle('main.css');
 
         $cryptopay = Services::preparePaymentProcess('donation', false);
 
-        return $this->addons->donation->view('donate-box', [
-            'currency' => $this->setting('donationCurrency'),
-            'amounts' => $this->setting('donationDonateAmounts'),
-            'theme' => $this->setting('theme'),
+        return Helpers::getAddon('donation')->view('donate-box', [
+            'currency' => Helpers::getSetting('donationCurrency'),
+            'amounts' => Helpers::getSetting('donationDonateAmounts'),
+            'theme' => Helpers::getSetting('theme'),
             'cryptopay' => $cryptopay,
         ]);
     }
-}
\ No newline at end of file
+}
diff --git a/app/DonateBox/DonateBoxWidget.php b/app/DonateBox/DonateBoxWidget.php
index 59f2d49..bd1274d 100644
--- a/app/DonateBox/DonateBoxWidget.php
+++ b/app/DonateBox/DonateBoxWidget.php
@@ -1,30 +1,42 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation\DonateBox;
 
-use \BeycanPress\CryptoPay\PluginHero\Helpers;
+use BeycanPress\CryptoPay\Helpers;
 
 class DonateBoxWidget extends \WP_Widget
 {
-    use Helpers;
-
-    function __construct()
+    /**
+     * Constructor
+     */
+    public function __construct()
     {
         parent::__construct(
-            __CLASS__, 
-            esc_html__('# CryptoPay Donation Box', 'cryptopay'), 
+            __CLASS__,
+            esc_html__('# CryptoPay Donation Box', 'cryptopay'),
             [
+                // @phpcs:ignore
                 'description' => esc_html__('With this widget you can add a box to your site to receive donations with cryptocurrencies.', 'cryptopay')
-            ] 
+            ]
         );
     }
-    
-    public function widget($args, $instance)
+
+    /**
+     * Widget
+     *
+     * @param array<string,string> $args
+     * @param array<string,string> $instance
+     * @return void
+     */
+    // @phpcs:ignore
+    public function widget($args, $instance): void
     {
         $title = apply_filters('widget_title', $instance['title']);
-            
+
         print($args['before_widget']);
-        
+
         $title = !empty($title) ? $title : esc_html__('CryptoPay Donation Box', 'cryptopay');
 
         print($args['before_title'] . $title . $args['after_title']);
@@ -33,17 +45,32 @@ public function widget($args, $instance)
 
         print($args['after_widget']);
     }
-    
-    public function form($instance) 
+
+    /**
+     * Form
+     *
+     * @param array<string,string> $instance
+     * @return void
+     */
+    // @phpcs:ignore
+    public function form($instance)
     {
         $title = isset($instance['title']) ? $instance['title'] : null;
-        $this->viewEcho('widget-form', compact('title'));
+        Helpers::getAddon('donation')->viewEcho('widget-form', compact('title'));
     }
-    
+
+    /**
+     * Update
+     *
+     * @param array<string,string> $newInstance
+     * @param array<string,string> $oldInstance
+     * @return array<string,string>
+     */
+    // @phpcs:ignore
     public function update($newInstance, $oldInstance)
     {
         $instance = [];
         $instance['title'] = !empty($newInstance['title']) ? sanitize_text_field($newInstance['title']) : null;
         return $instance;
-    }    
-} 
\ No newline at end of file
+    }
+}
diff --git a/app/Integrations.php b/app/Integrations.php
index f9ca3c3..8c0bd0a 100644
--- a/app/Integrations.php
+++ b/app/Integrations.php
@@ -1,50 +1,60 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation;
 
-use BeycanPress\CryptoPay\PluginHero\Helpers;
+use BeycanPress\CryptoPay\Helpers;
 
 class Integrations
 {
-    use Helpers;
-    
+    /**
+     * Constructor
+     */
     public function __construct()
     {
         // Register widget
-        add_action('widgets_init', function() {
+        add_action('widgets_init', function (): void {
             register_widget(DonateBox\DonateBoxWidget::class);
         });
 
         if (is_admin()) {
             // Register Gutenberg block
-            add_action('enqueue_block_editor_assets', function() {
+            add_action('enqueue_block_editor_assets', function (): void {
                 global $pagenow;
                 $dependencies = $pagenow === 'widgets.php' ? ['wp-edit-widgets'] : ['wp-editor'];
 
-                $this->addons->donation->addScript('gutenberg.js', array_merge($dependencies, ['jquery', 'wp-element', 'wp-blocks']));
-            });    
+                Helpers::getAddon('donation')->addScript(
+                    'gutenberg.js',
+                    array_merge($dependencies, ['jquery', 'wp-element', 'wp-blocks'])
+                );
+            });
 
             // Register TinyMCE button
-            add_action('admin_head', function() {
-                add_filter('mce_external_plugins', function($pluginArray) {
+            add_action('admin_head', function (): void {
+                add_filter('mce_external_plugins', function ($pluginArray) {
+                    // @phpcs:ignore
                     $pluginArray['beycanpress/cryptopay-donation-box'] = plugin_dir_url('cryptopay-donation/index.php') . 'assets/js/tinymce.js';
                     return $pluginArray;
                 });
-                add_filter('mce_buttons', function($buttons) {
+                add_filter('mce_buttons', function ($buttons) {
                     array_push($buttons, 'beycanpress/cryptopay-donation-box');
                     return $buttons;
                 });
             });
         } else {
-            add_filter('the_content', function($content) {
-                
+            add_filter('the_content', function ($content) {
                 if (function_exists('WC')) {
-                    if (is_checkout() || is_account_page() || is_woocommerce() || is_cart()) return $content;
-				}
+                    if (is_checkout() || is_account_page() || is_woocommerce() || is_cart()) {
+                        return $content;
+                    }
+                }
 
                 if (is_page() || is_single()) {
-                    $showIn = is_page() ? $this->setting('donationShowInPages') : $this->setting('donationShowInPosts');
-                    
+                    $showIn = is_page() ?
+                    Helpers::getSetting('donationShowInPages') :
+                    Helpers::getSetting('donationShowInPosts');
+
                     if ($showIn == 'show-in-begin') {
                         $content = do_shortcode('[cryptopay-donation-box]') . $content;
                     } elseif ($showIn == 'show-in-end') {
@@ -56,4 +66,4 @@ public function __construct()
             });
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/Lang.php b/app/Lang.php
index edc3a45..e5591f3 100644
--- a/app/Lang.php
+++ b/app/Lang.php
@@ -1,10 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation;
 
 class Lang
 {
-    public static function get() : array
+    /**
+     * @return array<string,string>
+     */
+    public static function get(): array
     {
         return [
             "orderAmount" => esc_html__('Donate amount', 'cryptopay'),
@@ -19,5 +24,4 @@ public static function get() : array
             "paymentTimedOut" => esc_html__('Donation timed out!', 'cryptopay'),
         ];
     }
-
-}
\ No newline at end of file
+}
diff --git a/app/Loader.php b/app/Loader.php
index 65b03e9..9a7b992 100644
--- a/app/Loader.php
+++ b/app/Loader.php
@@ -1,23 +1,26 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation;
 
+use BeycanPress\CryptoPay\Helpers;
 use BeycanPress\CryptoPay\PluginHero\Hook;
-use BeycanPress\CryptoPay\PluginHero\Helpers;
 use BeycanPress\CryptoPay\PluginHero\Updater;
 use BeycanPress\CryptoPay\Pages\TransactionPage;
 
 class Loader
 {
-    use Helpers;
-
+    /**
+     * @return void
+     */
     public function __construct()
     {
         new Updater([
             'requires' => '5.0',
-            'requires_php' => '7.4',
-            'plugin_file' =>  'cryptopay-donation/index.php',
-            'plugin_version' => $this->addons->donation->getVersion(),
+            'requires_php' => '8.1',
+            'plugin_file' =>  'cryptopay-donation/cryptopay-donation.php',
+            'plugin_version' => Helpers::getAddon('donation')->getVersion(),
             'icons' => [
                 '2x' => plugin_dir_url(dirname(__FILE__, 2) . '/index.php') . '/assets/images/icon-256x256.png',
                 '1x' => plugin_dir_url(dirname(__FILE__, 2) . '/index.php') . '/assets/images/icon-128x128.png',
@@ -25,27 +28,26 @@ public function __construct()
         ]);
 
         Hook::addFilter('apply_discount_donation', '__return_false');
-        Hook::addFilter('models', function($models) {
+        Hook::addFilter('models', function ($models) {
             return array_merge($models, [
                 'donation' => new Models\DonationTransaction()
             ]);
         });
 
         Hook::addFilter('transaction_status_donation', fn() => 'completed');
-        
+
         if (is_admin()) {
             new TransactionPage(
                 esc_html__('Donation transactions', 'cryptopay'),
                 'donation',
                 3,
                 [],
-                false,
                 ['orderId', 'status', 'updatedAt']
             );
         } else {
             new DonateBox\DonateBox();
         }
-        
+
         new Integrations();
     }
 }
diff --git a/app/Models/DonationTransaction.php b/app/Models/DonationTransaction.php
index 29a2fe2..9a282f1 100644
--- a/app/Models/DonationTransaction.php
+++ b/app/Models/DonationTransaction.php
@@ -1,15 +1,20 @@
 <?php
 
+declare(strict_types=1);
+
 namespace BeycanPress\CryptoPay\Donation\Models;
 
 use BeycanPress\CryptoPay\Models\AbstractTransaction;
 
-class DonationTransaction extends AbstractTransaction 
+class DonationTransaction extends AbstractTransaction
 {
-    public $addon = 'donation';
-    
+    public string $addon = 'donation';
+
+    /**
+     * Constructor
+     */
     public function __construct()
     {
         parent::__construct('donation_transaction');
     }
-}
\ No newline at end of file
+}
diff --git a/app/Settings.php b/app/Settings.php
index 22e23b8..c1c598c 100644
--- a/app/Settings.php
+++ b/app/Settings.php
@@ -1,4 +1,8 @@
-<?php 
+<?php
+
+declare(strict_types=1);
+
+// @phpcs:disable Generic.Files.LineLength
 
 namespace BeycanPress\CryptoPay\Donation;
 
@@ -7,10 +11,13 @@
 
 class Settings
 {
+    /**
+     * Constructor
+     */
     public function __construct()
     {
-        Setting::createSection(array(    
-            'id'     => 'donate', 
+        Setting::createSection(array(
+            'id'     => 'donate',
             'title'  => esc_html__('Donation settings', 'cryptopay'),
             'icon'   => 'fas fa-donate',
             'fields' => array(
@@ -81,4 +88,4 @@ public function __construct()
             )
         ));
     }
-}
\ No newline at end of file
+}
diff --git a/composer.json b/composer.json
index d6a6160..d4cf232 100644
--- a/composer.json
+++ b/composer.json
@@ -1,4 +1,9 @@
 {
+    "scripts": {
+        "phpcs": "phpcs --standard=phpcs.xml .",
+        "phpcbf": "phpcbf --standard=phpcs.xml .",
+        "install-phpcs": "composer config --global --no-plugins allow-plugins.dealerdirect/phpcodesniffer-composer-installer true && composer global require --dev squizlabs/php_codesniffer=* slevomat/coding-standard"
+    },
     "autoload": {
         "psr-4": {
             "BeycanPress\\CryptoPay\\Donation\\": "app"
diff --git a/cryptopay-donation.php b/cryptopay-donation.php
index 0ec9560..0034b9e 100644
--- a/cryptopay-donation.php
+++ b/cryptopay-donation.php
@@ -1,6 +1,12 @@
-<?php 
+<?php
 
-namespace BeycanPress\CryptoPay;
+declare(strict_types=1);
+
+defined('ABSPATH') || exit;
+
+// @phpcs:disable PSR1.Files.SideEffects
+// @phpcs:disable PSR12.Files.FileHeader
+// @phpcs:disable Generic.Files.LineLength
 
 /**
  * Plugin Name: CryptoPay Donation
@@ -19,28 +25,27 @@
 */
 
 use BeycanPress\CryptoPay\Loader;
-use BeycanPress\CryptoPay\Services;
+use BeycanPress\CryptoPay\Helpers;
 use BeycanPress\CryptoPay\PluginHero\Hook;
 use BeycanPress\CryptoPay\PluginHero\Plugin;
 
-add_action('plugins_loaded', function() {
+add_action('plugins_loaded', function (): void {
 
     if (class_exists(Loader::class)) {
-
+        // @phpcs:ignore
         class Donation extends Plugin
         {
+            /**
+             * Constructor
+             */
             public function __construct()
             {
-                Services::registerAddon('donation');
-                $this->registerAddon('donation', __FILE__);
-                
-                require __DIR__ . '/vendor/autoload.php';
+                Helpers::registerAddon('donation', __FILE__);
 
-                if ($this->setting('license')) {
-                    new Donation\Loader();
-                }
+                require __DIR__ . '/vendor/autoload.php';
 
-                Hook::addAction("settings", function() {
+                new Donation\Loader();
+                Hook::addAction("settings", function (): void {
                     new Donation\Settings();
                 }, 90);
             }
diff --git a/index.php b/index.php
index 7e91415..1c090c1 100644
--- a/index.php
+++ b/index.php
@@ -1,2 +1,2 @@
-<?php
-// Silence is golden.
\ No newline at end of file
+<?php // @phpcs:ignore
+// Silence is golden.
diff --git a/cryptopay.pot b/languages/cryptopay.pot
similarity index 90%
rename from cryptopay.pot
rename to languages/cryptopay.pot
index 35c48a1..d5dcc94 100644
--- a/cryptopay.pot
+++ b/languages/cryptopay.pot
@@ -3,7 +3,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: CryptoPay Donation\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2023-04-08 17:41+0000\n"
+"POT-Creation-Date: 2024-01-24 11:47+0000\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: \n"
@@ -13,7 +13,7 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Loco https://localise.biz/\n"
-"X-Loco-Version: 2.6.4; wp-6.2\n"
+"X-Loco-Version: 2.6.6; wp-6.4.2\n"
 "X-Domain: cryptopay"
 
 #: app/DonateBox/DonateBoxWidget.php:15
@@ -29,7 +29,7 @@ msgid "Amount to be donated"
 msgstr ""
 
 #. Author of the plugin
-msgid "BeycanPress"
+msgid "BeycanPress LLC"
 msgstr ""
 
 #: views/donate-box.php:4
@@ -88,7 +88,7 @@ msgstr ""
 msgid "Donation timed out!"
 msgstr ""
 
-#: app/Loader.php:31
+#: app/Loader.php:38
 msgid "Donation transactions"
 msgstr ""
 
@@ -97,7 +97,7 @@ msgid "https://beycanpress.com"
 msgstr ""
 
 #. URI of the plugin
-msgid "https://beycanpress.com/"
+msgid "https://beycanpress.com/cryptopay/"
 msgstr ""
 
 #: app/Settings.php:73
@@ -116,12 +116,16 @@ msgstr ""
 msgid "Not show"
 msgstr ""
 
-#: views/donate-box.php:26
+#: views/donate-box.php:30
+msgid "Select currency"
+msgstr ""
+
+#: views/donate-box.php:28
 msgid "Select network"
 msgstr ""
 
 #: app/Settings.php:19
-msgid "Shorcode"
+msgid "Shortcode"
 msgstr ""
 
 #: app/Settings.php:64 app/Settings.php:76
diff --git a/phpcs.xml b/phpcs.xml
new file mode 100644
index 0000000..a905b03
--- /dev/null
+++ b/phpcs.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<ruleset name="BeycanPressStandard">
+    <rule ref="PSR12"/>
+    <description>
+        BeycanPressStandard
+    </description>
+    <file>./**/*.php</file>
+    <arg name="extensions" value="php"/>
+    <exclude-pattern>*/views/*</exclude-pattern>
+    <exclude-pattern>*/vendor/*</exclude-pattern>
+    <exclude-pattern>*/PluginHero/templates/*</exclude-pattern>
+    <arg name="standard" value="PSR12"/>
+    <rule ref="Generic.Files.InlineHTML"/>
+    <rule ref="Squiz.Commenting.FunctionComment.Missing"/>
+    <rule ref="Squiz.Commenting.FunctionComment.MissingParamTag"/>
+    <rule ref="Squiz.Commenting.FunctionComment.MissingParamName"/>
+    <rule ref="Squiz.Commenting.FunctionComment.ParamNameNoMatch"/>
+    <rule ref="Squiz.Commenting.FunctionComment.IncorrectTypeHint"/>
+    <rule ref="Squiz.Commenting.FunctionComment.MissingReturn"/>
+    <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">
+        <exclude name="SlevomatCodingStandard.TypeHints.DeclareStrictTypes.IncorrectStrictTypesFormat" />
+    </rule>
+    <rule ref="SlevomatCodingStandard.TypeHints.PropertyTypeHint">
+        <exclude name="SlevomatCodingStandard.TypeHints.PropertyTypeHint.UselessAnnotation" />
+    </rule>
+    <rule ref="SlevomatCodingStandard.TypeHints.ParameterTypeHint">
+        <exclude name="SlevomatCodingStandard.TypeHints.ParameterTypeHint.UselessAnnotation" />
+    </rule>
+    <rule ref="SlevomatCodingStandard.TypeHints.ReturnTypeHint">
+        <exclude name="SlevomatCodingStandard.TypeHints.ReturnTypeHint.UselessAnnotation" />
+    </rule>
+    <rule ref="SlevomatCodingStandard.Commenting.EmptyComment"/>
+    <rule ref="SlevomatCodingStandard.Commenting.AnnotationName"/>
+</ruleset>
diff --git a/views/donate-box.php b/views/donate-box.php
index 21d6dc8..8461c92 100644
--- a/views/donate-box.php
+++ b/views/donate-box.php
@@ -1,4 +1,7 @@
-<?php echo $cryptopay; ?>
+<?php 
+    use BeycanPress\CryptoPay\Helpers;
+    echo $cryptopay;
+?>
 <div class="cp-donation-container theme-<?php echo esc_attr($theme) ?>" data-currency="<?php echo esc_attr($currency) ?>">
     <div class="donation-box">
         <div class="title"><?php echo esc_html__('Choose donate amount', 'cryptopay') ?></div>
@@ -24,7 +27,7 @@
         <div class="donate-button">
             <i class="far fa-project-diagram"></i> 
             <?php 
-                if ($this->setting('mode') == 'network') {
+                if (Helpers::getSetting('mode') == 'network') {
                     echo esc_html__('Select network', 'cryptopay');
                 } else {
                     echo esc_html__('Select currency', 'cryptopay');