diff --git a/includes/admin/class-wc-stripe-inbox-notes.php b/includes/admin/class-wc-stripe-inbox-notes.php
new file mode 100644
index 0000000..94e74b4
--- /dev/null
+++ b/includes/admin/class-wc-stripe-inbox-notes.php
@@ -0,0 +1,230 @@
+<?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Class that adds Inbox notifications.
+ *
+ * @since 4.5.4
+ */
+class WC_Stripe_Inbox_Notes {
+	const SUCCESS_NOTE_NAME = 'stripe-apple-pay-marketing-guide-holiday-2020';
+	const FAILURE_NOTE_NAME = 'stripe-apple-pay-domain-verification-needed';
+
+	const POST_SETUP_SUCCESS_ACTION    = 'wc_stripe_apple_pay_post_setup_success';
+	const CAMPAIGN_2020_CLEANUP_ACTION = 'wc_stripe_apple_pay_2020_cleanup';
+
+	public function __construct() {
+		add_action( self::POST_SETUP_SUCCESS_ACTION, [ self::class, 'create_marketing_note' ] );
+		add_action( self::CAMPAIGN_2020_CLEANUP_ACTION, [ self::class, 'cleanup_campaign_2020' ] );
+		add_action( 'admin_init', [ self::class, 'create_upe_notes' ] );
+
+		// Schedule a 2020 holiday campaign cleanup action if needed.
+		// First, check to see if we are still before the cutoff.
+		// We don't need to (re)schedule this after the cutoff.
+		if ( time() < self::get_campaign_2020_cutoff() ) {
+			// If we don't have the clean up action scheduled, add it.
+			if ( ! wp_next_scheduled( self::CAMPAIGN_2020_CLEANUP_ACTION ) ) {
+				wp_schedule_single_event( self::get_campaign_2020_cutoff(), self::CAMPAIGN_2020_CLEANUP_ACTION );
+			}
+		}
+	}
+
+	public static function are_inbox_notes_supported() {
+		if ( ! class_exists( 'WC_Data_Store' ) ) {
+			return false;
+		}
+
+		try {
+			WC_Data_Store::load( 'admin-note' );
+		} catch ( Exception $e ) {
+			return false;
+		}
+
+		return trait_exists( 'Automattic\WooCommerce\Admin\Notes\NoteTraits' ) && class_exists( 'Automattic\WooCommerce\Admin\Notes\Note' );
+	}
+
+	public static function create_upe_notes() {
+		if ( ! self::are_inbox_notes_supported() ) {
+			return;
+		}
+
+		require_once WC_STRIPE_PLUGIN_PATH . '/includes/notes/class-wc-stripe-upe-availability-note.php';
+		WC_Stripe_UPE_Availability_Note::init();
+
+		require_once WC_STRIPE_PLUGIN_PATH . '/includes/notes/class-wc-stripe-upe-stripelink-note.php';
+		WC_Stripe_UPE_StripeLink_Note::init( WC_Stripe::get_instance()->get_main_stripe_gateway() );
+	}
+
+	public static function get_campaign_2020_cutoff() {
+		return strtotime( '22 December 2020' );
+	}
+
+	public static function get_success_title() {
+		if ( time() < self::get_campaign_2020_cutoff() ) {
+			return __( 'Boost sales this holiday season with Apple Pay!', 'woocommerce-gateway-stripe' );
+		}
+
+		return __( 'Boost sales with Apple Pay!', 'woocommerce-gateway-stripe' );
+	}
+
+	/**
+	 * Manage notes to show after Apple Pay domain verification.
+	 */
+	public static function notify_on_apple_pay_domain_verification( $verification_complete ) {
+		$admin_notes_class = WC_Stripe_Woo_Compat_Utils::get_notes_class();
+		if ( ! class_exists( $admin_notes_class ) || ! class_exists( 'WC_Data_Store' ) ) {
+			return;
+		}
+
+		try {
+			$data_store       = WC_Data_Store::load( 'admin-note' );
+			$failure_note_ids = $data_store->get_notes_with_name( self::FAILURE_NOTE_NAME );
+			// Delete all previously created, soft deleted and unactioned failure notes (Legacy).
+			while ( ! empty( $failure_note_ids ) ) {
+				$note_id = array_pop( $failure_note_ids );
+				$note    = $admin_notes_class::get_note( $note_id );
+				$note->delete();
+			}
+		} catch ( Exception $e ) {} // @codingStandardsIgnoreLine
+
+		if ( $verification_complete ) {
+			if ( self::should_show_marketing_note() && ! wp_next_scheduled( self::POST_SETUP_SUCCESS_ACTION ) ) {
+				wp_schedule_single_event( time() + DAY_IN_SECONDS, self::POST_SETUP_SUCCESS_ACTION );
+			}
+		} else {
+			// Create new note if verification failed.
+			self::create_failure_note();
+		}
+	}
+
+	/**
+	 * Whether conditions are right for the marketing note.
+	 */
+	public static function should_show_marketing_note() {
+		// Display to US merchants only.
+		$base_location = wc_get_base_location();
+		if ( ! $base_location || 'US' !== $base_location['country'] ) {
+			return false;
+		}
+
+		// Make sure Apple Pay is enabled and setup is successful.
+		$stripe_settings       = get_option( 'woocommerce_stripe_settings', [] );
+		$stripe_enabled        = isset( $stripe_settings['enabled'] ) && 'yes' === $stripe_settings['enabled'];
+		$button_enabled        = isset( $stripe_settings['payment_request'] ) && 'yes' === $stripe_settings['payment_request'];
+		$verification_complete = isset( $stripe_settings['apple_pay_domain_set'] ) && 'yes' === $stripe_settings['apple_pay_domain_set'];
+		if ( ! $stripe_enabled || ! $button_enabled || ! $verification_complete ) {
+			return false;
+		}
+
+		// Make sure note doesn't already exist.
+		try {
+			$data_store       = WC_Data_Store::load( 'admin-note' );
+			$success_note_ids = $data_store->get_notes_with_name( self::SUCCESS_NOTE_NAME );
+			if ( ! empty( $success_note_ids ) ) {
+				return false;
+			}
+		} catch ( Exception $e ) {
+			return false; // If unable to check, assume it shouldn't show note.
+		}
+
+		return true;
+	}
+
+	/**
+	 * If conditions are right, show note promoting Apple Pay marketing guide.
+	 */
+	public static function create_marketing_note() {
+		// Make sure conditions for this note still hold.
+		if ( ! self::should_show_marketing_note() || ! self::are_inbox_notes_supported() ) {
+			return;
+		}
+
+		try {
+			$admin_note_class = WC_Stripe_Woo_Compat_Utils::get_note_class();
+			$note             = new $admin_note_class();
+			$note->set_title( self::get_success_title() );
+			$note->set_content( __( 'Now that you accept Apple Pay® with Stripe, you can increase conversion rates by letting your customers know that Apple Pay is available. Here’s a marketing guide to help you get started.', 'woocommerce-gateway-stripe' ) );
+			$note->set_type( $admin_note_class::E_WC_ADMIN_NOTE_MARKETING );
+			$note->set_name( self::SUCCESS_NOTE_NAME );
+			$note->set_source( 'woocommerce-gateway-stripe' );
+			$note->add_action(
+				'marketing-guide',
+				__( 'See marketing guide', 'woocommerce-gateway-stripe' ),
+				'https://developer.apple.com/apple-pay/marketing/'
+			);
+			$note->save();
+		} catch ( Exception $e ) {} // @codingStandardsIgnoreLine.
+	}
+
+	/**
+	 * Show note indicating domain verification failure.
+	 */
+	public static function create_failure_note() {
+		try {
+			$admin_note_class = WC_Stripe_Woo_Compat_Utils::get_note_class();
+			$note             = new $admin_note_class();
+			$note->set_title( __( 'Apple Pay domain verification needed', 'woocommerce-gateway-stripe' ) );
+			$note->set_content( __( 'The WooCommerce Stripe Gateway extension attempted to perform domain verification on behalf of your store, but was unable to do so. This must be resolved before Apple Pay can be offered to your customers.', 'woocommerce-gateway-stripe' ) );
+			$note->set_type( $admin_note_class::E_WC_ADMIN_NOTE_INFORMATIONAL );
+			$note->set_name( self::FAILURE_NOTE_NAME );
+			$note->set_source( 'woocommerce-gateway-stripe' );
+			$note->add_action(
+				'learn-more',
+				__( 'Learn more', 'woocommerce-gateway-stripe' ),
+				'https://woocommerce.com/document/stripe/#apple-pay'
+			);
+			$note->save();
+		} catch ( Exception $e ) {} // @codingStandardsIgnoreLine.
+	}
+
+	/**
+	 * Destroy unactioned inbox notes from the 2020 holiday campaign, replacing
+	 * them with a non-holiday note promoting Apple Pay. This will be run once
+	 * on/about 2020 Dec 22.
+	 */
+	public static function cleanup_campaign_2020() {
+		if ( ! self::are_inbox_notes_supported() ) {
+			return;
+		}
+
+		$admin_notes_class = WC_Stripe_Woo_Compat_Utils::get_notes_class();
+		if ( ! class_exists( $admin_notes_class ) || ! class_exists( 'WC_Data_Store' ) ) {
+			return;
+		}
+
+		$note_ids = [];
+
+		try {
+			$data_store = WC_Data_Store::load( 'admin-note' );
+			$note_ids   = $data_store->get_notes_with_name( self::SUCCESS_NOTE_NAME );
+			if ( empty( $note_ids ) ) {
+				return;
+			}
+		} catch ( Exception $e ) {
+			return;
+		}
+
+		$deleted_an_unactioned_note = false;
+
+		$admin_note_class = WC_Stripe_Woo_Compat_Utils::get_note_class();
+		foreach ( (array) $note_ids as $note_id ) {
+			try {
+				$note = new $admin_note_class( $note_id );
+				if ( $admin_note_class::E_WC_ADMIN_NOTE_UNACTIONED == $note->get_status() ) {
+					$note->delete();
+					$deleted_an_unactioned_note = true;
+				}
+				unset( $note );
+			} catch ( Exception $e ) {} // @codingStandardsIgnoreLine.
+		}
+
+		if ( $deleted_an_unactioned_note ) {
+			self::create_marketing_note();
+		}
+	}
+}
+
+new WC_Stripe_Inbox_Notes();