diff --git a/ChangeLog.txt b/ChangeLog.txt
index 843399b..e7ab044 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -7,6 +7,7 @@
 * Fix some Coding Standards Issues
 * Correct maximum execution time limit to 5 minutes
 * Fix some new Coding Standards errors and warnings
+* Applied coding standards to MO Notice class
 * Clean unused global variables
 * Implemented compatibility with Fusion Builder
 * Fix error caused by menu registration in WordPress 5.3
diff --git a/classes/class-mo-admin-notice.php b/classes/class-mo-admin-notice.php
new file mode 100644
index 0000000..dc787a8
--- /dev/null
+++ b/classes/class-mo-admin-notice.php
@@ -0,0 +1,183 @@
+<?php
+
+if ( ! class_exists( 'MO_Admin_Notice' ) ) {
+
+	class MO_Admin_Notice {
+		public function __construct() {
+			add_action( 'admin_notices', array( $this, 'admin_notice' ) );
+			add_action( 'network_admin_notices', array( $this, 'admin_notice' ) );
+
+			add_action( 'admin_init', array( $this, 'dismiss_admin_notice' ) );
+		}
+
+		public function dismiss_admin_notice() {
+			if ( ! isset( $_GET['mo-adaction'] ) || 'mo_dismiss_adnotice' !== $_GET['mo-adaction'] ) {
+				return;
+			}
+
+			$url = admin_url();
+			update_option( 'mo_dismiss_adnotice', 'true' );
+
+			wp_safe_redirect( $url );
+			exit;
+		}
+
+		public function admin_notice() {
+
+			global $pagenow;
+
+			if ( 'index.php' === $pagenow || ( isset( $_GET['page'] ) && false !== strpos( $_GET['page'], 's2_' ) ) ) {
+
+				if ( get_option( 'mo_dismiss_adnotice', 'false' ) === 'true' ) {
+					return;
+				}
+
+				if ( $this->is_plugin_installed() && $this->is_plugin_active() ) {
+					return;
+				}
+
+				$dismiss_url = esc_url_raw(
+					add_query_arg(
+						array(
+							'mo-adaction' => 'mo_dismiss_adnotice',
+						),
+						admin_url()
+					)
+				);
+				$this->notice_css();
+				$install_url = wp_nonce_url(
+					admin_url( 'update.php?action=install-plugin&plugin=mailoptin' ),
+					'install-plugin_mailoptin'
+				);
+
+				$activate_url = wp_nonce_url( admin_url( 'plugins.php?action=activate&plugin=mailoptin%2Fmailoptin.php' ), 'activate-plugin_mailoptin/mailoptin.php' );
+				?>
+				<div class="mo-admin-notice notice notice-success">
+					<div class="mo-notice-first-half">
+						<p>
+							<?php
+							printf(
+								// Translators: Mail Optin admin notice
+								__( 'Free optin form plugin that will %1$sincrease your email list subscribers%2$s and keep them engaged with %1$sautomated and schedule newsletters%2$s.', 'subscribe2' ),
+								'<span class="mo-stylize"><strong>',
+								'</strong></span>'
+							);
+							?>
+						</p>
+						<p style="text-decoration: underline;font-size: 12px;">Recommended by Subscribe2 plugin</p>
+					</div>
+					<div class="mo-notice-other-half">
+						<?php if ( ! $this->is_plugin_installed() ) : ?>
+							<a class="button button-primary button-hero" id="mo-install-mailoptin-plugin" href="<?php echo $install_url; ?>">
+								<?php _e( 'Install MailOptin Now for Free!', 'subscribe2' ); ?>
+							</a>
+						<?php endif; ?>
+						<?php if ( $this->is_plugin_installed() && ! $this->is_plugin_active() ) : ?>
+							<a class="button button-primary button-hero" id="mo-activate-mailoptin-plugin" href="<?php echo $activate_url; ?>">
+								<?php _e( 'Activate MailOptin Now!', 'subscribe2' ); ?>
+							</a>
+						<?php endif; ?>
+						<div class="mo-notice-learn-more">
+							<a target="_blank" href="https://mailoptin.io">Learn more</a>
+						</div>
+					</div>
+					<a href="<?php echo $dismiss_url; ?>">
+						<button type="button" class="notice-dismiss">
+							<span class="screen-reader-text"><?php _e( 'Dismiss this notice', 'subscribe2' ); ?>.</span>
+						</button>
+					</a>
+				</div>
+				<?php
+			}
+		}
+
+		public function current_admin_url() {
+			$parts = wp_parse_url( home_url() );
+			$uri   = $parts['scheme'] . '://' . $parts['host'];
+
+			if ( array_key_exists( 'port', $parts ) ) {
+				$uri .= ':' . $parts['port'];
+			}
+
+			$uri .= add_query_arg( array() );
+
+			return $uri;
+		}
+
+		public function is_plugin_installed() {
+			$installed_plugins = get_plugins();
+
+			return isset( $installed_plugins['mailoptin/mailoptin.php'] );
+		}
+
+		public function is_plugin_active() {
+			return is_plugin_active( 'mailoptin/mailoptin.php' );
+		}
+
+		public function notice_css() {
+			?>
+			<style type="text/css">
+				.mo-admin-notice {
+					background: #fff;
+					color: #000;
+					border-left-color: #46b450;
+					position: relative;
+				}
+
+				.mo-admin-notice .notice-dismiss:before {
+					color: #72777c;
+				}
+
+				.mo-admin-notice .mo-stylize {
+					line-height: 2;
+				}
+
+				.mo-admin-notice .button-primary {
+					background: #006799;
+					text-shadow: none;
+					border: 0;
+					box-shadow: none;
+				}
+
+				.mo-notice-first-half {
+					width: 66%;
+					display: inline-block;
+					margin: 10px 0;
+				}
+
+				.mo-notice-other-half {
+					width: 33%;
+					display: inline-block;
+					padding: 20px 0;
+					position: absolute;
+					text-align: center;
+				}
+
+				.mo-notice-first-half p {
+					font-size: 14px;
+				}
+
+				.mo-notice-learn-more a {
+					margin: 10px;
+				}
+
+				.mo-notice-learn-more {
+					margin-top: 10px;
+				}
+			</style>
+			<?php
+		}
+
+		public static function instance() {
+			static $instance = null;
+
+			if ( is_null( $instance ) ) {
+				$instance = new self();
+			}
+
+			return $instance;
+		}
+	}
+
+	MO_Admin_Notice::instance();
+}
diff --git a/classes/class-s2-core.php b/classes/class-s2-core.php
index 78cf2eb..940a736 100644
--- a/classes/class-s2-core.php
+++ b/classes/class-s2-core.php
@@ -1982,7 +1982,7 @@ public function s2init() {
 			add_filter( 'set-screen-option', array( &$this, 'subscribers_set_screen_option' ), 10, 3 );
 
 			// MailOptin admin notices
-			require_once S2PATH . 'classes/mo-notice.php';
+			require_once S2PATH . 'classes/class-mo-admin-notice.php';
 
 			// capture CSV export
 			if ( isset( $_POST['s2_admin'] ) && isset( $_POST['csv'] ) ) {
diff --git a/classes/mo-notice.php b/classes/mo-notice.php
deleted file mode 100644
index cb60684..0000000
--- a/classes/mo-notice.php
+++ /dev/null
@@ -1,180 +0,0 @@
-<?php
-
-if ( ! class_exists( 'MO_Admin_Notice' ) ) {
-
-    class MO_Admin_Notice {
-        public function __construct() {
-            add_action( 'admin_notices', array( $this, 'admin_notice' ) );
-            add_action( 'network_admin_notices', array( $this, 'admin_notice' ) );
-
-            add_action( 'admin_init', array( $this, 'dismiss_admin_notice' ) );
-        }
-
-        public function dismiss_admin_notice() {
-            if ( ! isset( $_GET['mo-adaction'] ) || $_GET['mo-adaction'] != 'mo_dismiss_adnotice' ) {
-                return;
-            }
-
-            $url = admin_url();
-            update_option( 'mo_dismiss_adnotice', 'true' );
-
-            wp_redirect( $url );
-            exit;
-        }
-
-        public function admin_notice() {
-
-            global $pagenow;
-
-            if($pagenow == 'index.php' || (isset($_GET['page']) && strpos($_GET['page'], 's2_') !== false)) {
-
-                if (get_option('mo_dismiss_adnotice', 'false') == 'true') {
-                    return;
-                }
-
-                if ($this->is_plugin_installed() && $this->is_plugin_active()) {
-                    return;
-                }
-
-                $dismiss_url = esc_url_raw(
-                    add_query_arg(
-                        array(
-                            'mo-adaction' => 'mo_dismiss_adnotice'
-                        ),
-                        admin_url()
-                    )
-                );
-                $this->notice_css();
-                $install_url = wp_nonce_url(
-                    admin_url('update.php?action=install-plugin&plugin=mailoptin'),
-                    'install-plugin_mailoptin'
-                );
-
-                $activate_url = wp_nonce_url(admin_url('plugins.php?action=activate&plugin=mailoptin%2Fmailoptin.php'), 'activate-plugin_mailoptin/mailoptin.php');
-                ?>
-                <div class="mo-admin-notice notice notice-success">
-                    <div class="mo-notice-first-half">
-                        <p>
-                            <?php
-                            printf(
-                                __('Free optin form plugin that will %1$sincrease your email list subscribers%2$s and keep them engaged with %1$sautomated and schedule newsletters%2$s.', 'subscribe2'),
-                                '<span class="mo-stylize"><strong>', '</strong></span>');
-                            ?>
-                        </p>
-                        <p style="text-decoration: underline;font-size: 12px;">Recommended by Subscribe2 plugin</p>
-                    </div>
-                    <div class="mo-notice-other-half">
-                        <?php if ( ! $this->is_plugin_installed()) : ?>
-                            <a class="button button-primary button-hero" id="mo-install-mailoptin-plugin" href="<?php echo $install_url; ?>">
-                                <?php _e('Install MailOptin Now for Free!', 'subscribe2'); ?>
-                            </a>
-                        <?php endif; ?>
-                        <?php if ($this->is_plugin_installed() && ! $this->is_plugin_active()) : ?>
-                            <a class="button button-primary button-hero" id="mo-activate-mailoptin-plugin" href="<?php echo $activate_url; ?>">
-                                <?php _e('Activate MailOptin Now!', 'subscribe2'); ?>
-                            </a>
-                        <?php endif; ?>
-                        <div class="mo-notice-learn-more">
-                            <a target="_blank" href="https://mailoptin.io">Learn more</a>
-                        </div>
-                    </div>
-                    <a href="<?php echo $dismiss_url; ?>">
-                        <button type="button" class="notice-dismiss">
-                            <span class="screen-reader-text"><?php _e('Dismiss this notice', 'subscribe2'); ?>.</span>
-                        </button>
-                    </a>
-                </div>
-                <?php
-            }
-        }
-
-        public function current_admin_url() {
-            $parts = parse_url( home_url() );
-            $uri   = $parts['scheme'] . '://' . $parts['host'];
-
-            if ( array_key_exists( 'port', $parts ) ) {
-                $uri .= ':' . $parts['port'];
-            }
-
-            $uri .= add_query_arg( array() );
-
-            return $uri;
-        }
-
-        public function is_plugin_installed() {
-            $installed_plugins = get_plugins();
-
-            return isset( $installed_plugins['mailoptin/mailoptin.php'] );
-        }
-
-        public function is_plugin_active() {
-            return is_plugin_active( 'mailoptin/mailoptin.php' );
-        }
-
-        public function notice_css() {
-            ?>
-            <style type="text/css">
-                .mo-admin-notice {
-                    background: #fff;
-                    color: #000;
-                    border-left-color: #46b450;
-                    position: relative;
-                }
-
-                .mo-admin-notice .notice-dismiss:before {
-                    color: #72777c;
-                }
-
-                .mo-admin-notice .mo-stylize {
-                    line-height: 2;
-                }
-
-                .mo-admin-notice .button-primary {
-                    background: #006799;
-                    text-shadow: none;
-                    border: 0;
-                    box-shadow: none;
-                }
-
-                .mo-notice-first-half {
-                    width: 66%;
-                    display: inline-block;
-                    margin: 10px 0;
-                }
-
-                .mo-notice-other-half {
-                    width: 33%;
-                    display: inline-block;
-                    padding: 20px 0;
-                    position: absolute;
-                    text-align: center;
-                }
-
-                .mo-notice-first-half p {
-                    font-size: 14px;
-                }
-
-                .mo-notice-learn-more a {
-                    margin: 10px;
-                }
-
-                .mo-notice-learn-more {
-                    margin-top: 10px;
-                }
-            </style>
-            <?php
-        }
-
-        public static function instance() {
-            static $instance = null;
-
-            if ( is_null( $instance ) ) {
-                $instance = new self();
-            }
-
-            return $instance;
-        }
-    }
-
-    MO_Admin_Notice::instance();
-}
\ No newline at end of file