Initial commit
diff --git a/includes/notes/class-wc-stripe-upe-availability-note.php b/includes/notes/class-wc-stripe-upe-availability-note.php
new file mode 100644
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+++ b/includes/notes/class-wc-stripe-upe-availability-note.php
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+<?php
+/**
+ * Display a notice to merchants to inform about UPE.
+ *
+ * @package WooCommerce\Payments\Admin
+ */
+
+use Automattic\WooCommerce\Admin\Notes\NoteTraits;
+use Automattic\WooCommerce\Admin\Notes\Note;
+use Automattic\WooCommerce\Admin\Notes\WC_Admin_Note;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Class WC_Stripe_UPE_Availability_Note
+ */
+class WC_Stripe_UPE_Availability_Note {
+	use NoteTraits;
+
+	/**
+	 * Name of the note for use in the database.
+	 */
+	const NOTE_NAME = 'wc-stripe-upe-availability-note';
+
+	/**
+	 * Link to enable the UPE in store.
+	 */
+	const ENABLE_IN_STORE_LINK = '?page=wc-settings&tab=checkout&section=stripe&panel=settings&highlight=enable-upe';
+
+
+	/**
+	 * Get the note.
+	 */
+	public static function get_note() {
+		$note_class = self::get_note_class();
+		$note       = new $note_class();
+
+		$note->set_title( __( 'Boost your sales with the new payment experience in Stripe', 'woocommerce-gateway-stripe' ) );
+		$message = sprintf(
+		/* translators: 1) HTML anchor open tag 2) HTML anchor closing tag */
+			__( 'Get early access to an improved checkout experience, now available to select merchants. %1$sLearn more%2$s.', 'woocommerce-gateway-stripe' ),
+			'<a href="https://woocommerce.com/document/stripe/#new-checkout-experience" target="_blank">',
+			'</a>'
+		);
+		$note->set_content( $message );
+		$note->set_type( $note_class::E_WC_ADMIN_NOTE_INFORMATIONAL );
+		$note->set_name( self::NOTE_NAME );
+		$note->set_source( 'woocommerce-gateway-stripe' );
+		$note->add_action(
+			self::NOTE_NAME,
+			__( 'Enable in your store', 'woocommerce-gateway-stripe' ),
+			self::ENABLE_IN_STORE_LINK,
+			$note_class::E_WC_ADMIN_NOTE_UNACTIONED,
+			true
+		);
+
+		return $note;
+	}
+
+	/**
+	 * Get the class type to be used for the note.
+	 *
+	 * @return string
+	 */
+	private static function get_note_class() {
+		if ( class_exists( 'Automattic\WooCommerce\Admin\Notes\Note' ) ) {
+			return Note::class;
+		} else {
+			return WC_Admin_Note::class;
+		}
+	}
+
+	public static function init() {
+		/**
+		 * No need to display the admin inbox note when
+		 * - UPE preview is disabled
+		 * - UPE is already enabled
+		 * - UPE has been manually disabled
+		 * - Stripe is not enabled
+		 */
+		if ( ! WC_Stripe_Feature_Flags::is_upe_preview_enabled() ) {
+			return;
+		}
+
+		if ( WC_Stripe_Feature_Flags::is_upe_checkout_enabled() ) {
+			return;
+		}
+
+		if ( WC_Stripe_Feature_Flags::did_merchant_disable_upe() ) {
+			return;
+		}
+
+		if ( ! woocommerce_gateway_stripe()->connect->is_connected() ) {
+			return;
+		}
+
+		$stripe_settings = get_option( 'woocommerce_stripe_settings', [] );
+		$stripe_enabled  = isset( $stripe_settings['enabled'] ) && 'yes' === $stripe_settings['enabled'];
+		if ( ! $stripe_enabled ) {
+			return;
+		}
+
+		self::possibly_add_note();
+	}
+}