diff --git a/includes/admin/class-wc-stripe-upe-compatibility-controller.php b/includes/admin/class-wc-stripe-upe-compatibility-controller.php
new file mode 100644
index 0000000..e0792b8
--- /dev/null
+++ b/includes/admin/class-wc-stripe-upe-compatibility-controller.php
@@ -0,0 +1,124 @@
+<?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Controls the UPE compatibility before we release UPE - adds some notices for the merchant if necessary.
+ *
+ * @since 5.5.0
+ */
+class WC_Stripe_UPE_Compatibility_Controller {
+	public function __construct() {
+		add_action( 'admin_notices', [ $this, 'add_compatibility_notice' ] );
+	}
+
+	/**
+	 * I created this as a separate method, so it can be mocked in unit tests.
+	 *
+	 * @retun string
+	 */
+	public function get_wc_version() {
+		return WC_VERSION;
+	}
+
+	/**
+	 * Adds a compatibility notice in the `wp-admin` area in case the version of WooCommerce or WordPress are (or will be) not supported.
+	 */
+	public function add_compatibility_notice() {
+		/*
+		 * The following might be hard to read, but here's what I'm trying to do:
+		 * - If WP and WC are both supported -> nothing to do
+		 * - If WC is not supported -> construct message saying "Stripe requires WooCommerce 5.4 or greater to be installed and active. Your version of WooCommerce [X.X] is no longer be supported"
+		 * - If WP is not supported -> construct message saying "Stripe requires WordPress 5.6 or greater. Your version of WordPress [X.X] is no longer be supported"
+		 * - If WC & WP are both not supported -> construct message saying "Stripe requires WordPress 5.6 or greater and WooCommerce 5.4 or greater to be installed and active. Your versions of WordPress [X.X] and WooCommerce [X.X] are no longer be supported"
+		 */
+		$unsatisfied_requirements = array_filter(
+			[
+				[
+					'name'         => 'WordPress',
+					'version'      => get_bloginfo( 'version' ),
+					'is_supported' => WC_Stripe_UPE_Compatibility::is_wp_supported(),
+					/* translators: %s. WordPress version installed. */
+					'message'      => sprintf( __( 'WordPress %s or greater', 'woocommerce-gateway-stripe' ), WC_Stripe_UPE_Compatibility::MIN_WP_VERSION ),
+				],
+				[
+					'name'         => 'WooCommerce',
+					'version'      => $this->get_wc_version(),
+					'is_supported' => version_compare( $this->get_wc_version(), WC_Stripe_UPE_Compatibility::MIN_WC_VERSION, '>=' ),
+					'message'      => sprintf(
+					/* translators: %s. WooCommerce version installed. */
+						__(
+							'WooCommerce %s or greater to be installed and active',
+							'woocommerce-gateway-stripe'
+						),
+						WC_Stripe_UPE_Compatibility::MIN_WC_VERSION
+					),
+				],
+			],
+			function ( $requirement ) {
+				return ! $requirement['is_supported'];
+			}
+		);
+
+		if ( count( $unsatisfied_requirements ) === 0 ) {
+			return;
+		}
+
+		$this->show_current_compatibility_notice( $unsatisfied_requirements );
+	}
+
+	private function get_installed_versions_message( $unsatisfied_requirements ) {
+		return join(
+			__( ' and ', 'woocommerce-gateway-stripe' ),
+			array_map(
+				function ( $requirement ) {
+					return $requirement['name'] . ' ' . $requirement['version'];
+				},
+				$unsatisfied_requirements
+			)
+		);
+	}
+
+	private function get_unsatisfied_requirements_message( $unsatisfied_requirements ) {
+		return join(
+			__( ' and ', 'woocommerce-gateway-stripe' ),
+			array_map(
+				function ( $requirement ) {
+					return $requirement['message'];
+				},
+				$unsatisfied_requirements
+			)
+		);
+	}
+
+	private function show_current_compatibility_notice( $unsatisfied_requirements ) {
+		/*
+		 * The following might be hard to read, but here's what I'm trying to do:
+		 * - If WP and WC are both supported -> nothing to do
+		 * - If WC is not supported -> construct message saying "WooCommerce Stripe requires WooCommerce 5.4 or greater to be installed and active. Your version of WooCommerce [X.X] is no longer supported"
+		 * - If WP is not supported -> construct message saying "WooCommerce Stripe requires WordPress 5.6 or greater. Your version of WordPress [X.X] is no longer supported"
+		 * - If WC & WP are both not supported -> construct message saying "WooCommerce Stripe requires WordPress 5.6 or greater and WooCommerce 5.4 or greater to be installed and active. Your versions of WordPress [X.X] and WooCommerce [X.X] are no longer supported"
+		 */
+		$unsatisfied_requirements_message = $this->get_unsatisfied_requirements_message( $unsatisfied_requirements );
+
+		$unsatisfied_requirements_versions = $this->get_installed_versions_message( $unsatisfied_requirements );
+
+		echo '<div class="error"><p><strong>';
+		echo wp_kses_post(
+			sprintf(
+			/* translators: $1. Minimum WooCommerce and/or WordPress versions. $2. Current WooCommerce and/or versions. $3 Learn more link. */
+				_n(
+					'WooCommerce Stripe requires %1$s. Your version of %2$s is no longer supported.',
+					'WooCommerce Stripe requires %1$s. Your versions of %2$s are no longer supported.',
+					count( $unsatisfied_requirements ),
+					'woocommerce-gateway-stripe'
+				),
+				$unsatisfied_requirements_message,
+				$unsatisfied_requirements_versions
+			)
+		);
+		echo '</strong></p></div>';
+	}
+}