diff --git a/includes/reader-revenue/woocommerce/class-woocommerce-connection.php b/includes/reader-revenue/woocommerce/class-woocommerce-connection.php
index fc1c5835e0..48f1f7ce36 100644
--- a/includes/reader-revenue/woocommerce/class-woocommerce-connection.php
+++ b/includes/reader-revenue/woocommerce/class-woocommerce-connection.php
@@ -35,6 +35,7 @@ public static function init() {
 		include_once __DIR__ . '/class-woocommerce-cover-fees.php';
 		include_once __DIR__ . '/class-woocommerce-order-utm.php';
 		include_once __DIR__ . '/class-woocommerce-products.php';
+		include_once __DIR__ . '/class-woocommerce-duplicate-orders.php';
 
 		\add_action( 'admin_init', [ __CLASS__, 'disable_woocommerce_setup' ] );
 		\add_filter( 'option_woocommerce_subscriptions_allow_switching', [ __CLASS__, 'force_allow_subscription_switching' ], 10, 2 );
diff --git a/includes/reader-revenue/woocommerce/class-woocommerce-duplicate-orders.php b/includes/reader-revenue/woocommerce/class-woocommerce-duplicate-orders.php
new file mode 100644
index 0000000000..310747a469
--- /dev/null
+++ b/includes/reader-revenue/woocommerce/class-woocommerce-duplicate-orders.php
@@ -0,0 +1,250 @@
+<?php
+/**
+ * Adds an admin notice when possibly duplicated orders are detected.
+ *
+ * @package Newspack
+ */
+
+namespace Newspack;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Adds an admin notice when possibly duplicated orders are detected.
+ */
+class WooCommerce_Duplicate_Orders {
+	const CRON_HOOK_NAME = 'newspack_wc_check_order_duplicates';
+	const ADMIN_NOTICE_TRANSIENT_NAME = 'newspack_wc_check_order_duplicates_admin_notice';
+	const DUPLICATED_ORDERS_OPTION_NAME = 'newspack_wc_order_duplicates';
+	const DISMISSED_DUPLICATES_OPTION_NAME = 'newspack_wc_order_duplicates_dismissed';
+
+	/**
+	 * Initialize.
+	 *
+	 * @codeCoverageIgnore
+	 */
+	public static function init(): void {
+		if ( ! wp_next_scheduled( self::CRON_HOOK_NAME ) ) {
+			wp_schedule_event( time(), 'daily', self::CRON_HOOK_NAME );
+		}
+		add_action( self::CRON_HOOK_NAME, [ __CLASS__, 'check_for_order_duplicates' ] );
+		add_action( 'admin_notices', [ __CLASS__, 'display_admin_notice' ] );
+
+		if ( defined( 'WP_CLI' ) && WP_CLI ) {
+			\WP_CLI::add_command( 'newspack detect-order-duplicates', [ __CLASS__, 'cli_upsert_order_duplicates' ] );
+		}
+	}
+
+	/**
+	 * Detect duplicate orders.
+	 * Duplicates will be detected if it the same amount, same day, from the same customer.
+	 *
+	 * @param number $cutoff_time The cutoff time in the past (how many seconds ago).
+	 * @param number $current_page Current page of results.
+	 * @param array  $results Results to be merged with new results.
+	 */
+	public static function get_order_duplicates( $cutoff_time, $current_page = 0, $results = [] ): array {
+		$per_page = 100;
+		$order_result = wc_get_orders(
+			[
+				'paginate'       => true,
+				'limit'          => $per_page,
+				'status'         => [ 'wc-completed' ],
+				'offset'         => $current_page * $per_page,
+				'date_completed' => '>' . ( time() - $cutoff_time ),
+			]
+		);
+
+		if ( defined( 'WP_CLI' ) && WP_CLI && $order_result->max_num_pages > 0 ) {
+			\WP_CLI::line( sprintf( 'Processing page %d/%d of orders.', $current_page + 1, $order_result->max_num_pages ) );
+		}
+
+		$orders = $order_result->orders;
+		$order_duplicates = [];
+
+		foreach ( $orders as $order ) {
+			$email = $order->get_billing_email();
+			$amount = $order->get_total();
+			$date = $order->get_date_created()->date( 'Y-m-d' );
+
+			if ( \wcs_order_contains_renewal( $order ) || \wcs_order_contains_resubscribe( $order ) ) {
+				continue;
+			}
+
+			if ( ! isset( $order_duplicates[ $email ] ) ) {
+				$order_duplicates[ $email ] = [];
+			}
+
+			if ( ! isset( $order_duplicates[ $email ][ $amount ] ) ) {
+				$order_duplicates[ $email ][ $amount ] = [];
+			}
+
+			if ( ! isset( $order_duplicates[ $email ][ $amount ][ $date ] ) ) {
+				$order_duplicates[ $email ][ $amount ][ $date ] = [];
+			}
+
+			$order_duplicates[ $email ][ $amount ][ $date ][] = $order->get_id();
+		}
+
+		foreach ( $order_duplicates as $email => $amounts ) {
+			foreach ( $amounts as $amount => $dates ) {
+				foreach ( $dates as $date => $order_ids ) {
+					if ( count( $order_ids ) > 1 ) {
+						sort( $order_ids );
+						$ids = implode( ',', $order_ids );
+						$results[ $ids ] = [
+							'email'  => $email,
+							'amount' => $amount,
+							'date'   => $date,
+							'ids'    => $ids,
+						];
+					}
+				}
+			}
+		}
+
+		if ( $order_result->total > 0 ) {
+			$current_page++;
+			return self::get_order_duplicates( $cutoff_time, $current_page, $results );
+		}
+
+		return $results;
+	}
+
+	/**
+	 * Check for duplicate orders and save the result in an option.
+	 *
+	 * @param number $cutoff_time The cutoff time in the past (how many seconds ago).
+	 * @param bool   $save Whether to save the result as the option.
+	 * @param bool   $upsert Whether to upsert the option (merge with existing).
+	 */
+	public static function check_for_order_duplicates( $cutoff_time = DAY_IN_SECONDS, $save = false, $upsert = true ): array {
+		$order_duplicates = self::get_order_duplicates( $cutoff_time );
+		if ( empty( $order_duplicates ) ) {
+			return [];
+		}
+		if ( $save ) {
+			if ( $upsert ) {
+				$existing_order_duplicates = get_option( self::DUPLICATED_ORDERS_OPTION_NAME, [] );
+				foreach ( $existing_order_duplicates as $key => $value ) {
+					if ( isset( $order_duplicates[ $key ] ) ) {
+						continue;
+					}
+					$order_duplicates[ $key ] = $value;
+				}
+			}
+			update_option( self::DUPLICATED_ORDERS_OPTION_NAME, $order_duplicates );
+		}
+		return $order_duplicates;
+	}
+
+	/**
+	 * Display an admin notice if duplicate orders are found.
+	 */
+	public static function display_admin_notice(): void {
+		if ( ! function_exists( 'wc_price' ) ) {
+			return;
+		}
+		$existing_order_duplicates = get_option( self::DUPLICATED_ORDERS_OPTION_NAME, [] );
+		if ( empty( $existing_order_duplicates ) ) {
+			return;
+		}
+		$dismissed_duplicates = get_option( self::DISMISSED_DUPLICATES_OPTION_NAME, [] );
+		?>
+		<div class="notice notice-info is-dismissible">
+			<!-- Admin notice added by newspack-plugin -->
+			<details>
+				<summary style="margin: 0.6em 0; cursor: pointer;">
+					<?php echo esc_html__( 'There are some potentially duplicate transactions to review. Some of these might be intentional. Click this message to display the list of possible duplicates.', 'newspack-plugin' ); ?>
+				</summary>
+				<ul>
+					<?php foreach ( $existing_order_duplicates as $order_duplicates ) : ?>
+						<?php
+						if ( in_array( $order_duplicates['ids'], $dismissed_duplicates ) ) {
+							continue;}
+						?>
+						<li style="display: flex; align-items: center;">
+							<p style="margin: 0;">
+
+							<?php
+							ob_start();
+							?>
+								<a href="<?php echo esc_url( admin_url( 'edit.php?s=' . urlencode( $order_duplicates['email'] ) . '&post_type=shop_order' ) ); ?>"><?php echo esc_html( $order_duplicates['email'] ); ?></a>
+							<?php
+							$customer_email = ob_get_clean();
+
+							ob_start();
+							$order_ids = explode( ',', $order_duplicates['ids'] );
+							foreach ( $order_ids as $index => $order_id ) :
+								$order_url = admin_url( 'post.php?post=' . intval( $order_id ) . '&action=edit' );
+								?>
+									<a href="<?php echo esc_url( $order_url ); ?>"><?php echo esc_html( $order_id ); ?></a><?php echo ( $index < count( $order_ids ) - 1 ) ? ', ' : ''; ?>
+								<?php
+							endforeach;
+							$order_list = ob_get_clean();
+
+							printf(
+								/* translators: 1: customer email, 2: order amount, 3: orders date, 4: order IDs */
+								wp_kses_post( __( 'Customer %1$s made multiple orders of %2$s on %3$s. Orders: %4$s.', 'newspack-plugin' ) ),
+								wp_kses_post( $customer_email ),
+								wp_kses_post( \wc_price( $order_duplicates['amount'] ) ),
+								esc_html( date_i18n( get_option( 'date_format' ), strtotime( $order_duplicates['date'] ) ) ),
+								wp_kses_post( trim( $order_list ) )
+							);
+
+							$order_duplicates_id = implode( '-', $order_ids );
+						?>
+							</p>
+							<form method="post" style="display:inline; margin-left: 8px;">
+								<input type="hidden" name="dismiss_order_ids" value="<?php echo esc_attr( $order_duplicates['ids'] ); ?>">
+								<?php submit_button( __( 'Dismiss', 'newspack-plugin' ), 'small', 'dismiss_order', false, [ 'id' => 'dismiss_order_duplicates_' . $order_duplicates_id ] ); ?>
+							</form>
+						</li>
+					<?php endforeach; ?>
+				</ul>
+			</details>
+		</div>
+		<?php
+		if ( isset( $_POST['dismiss_order'] ) && isset( $_POST['dismiss_order_ids'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Missing
+			$dismissed_duplicates[] = $_POST['dismiss_order_ids']; // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
+			update_option( self::DISMISSED_DUPLICATES_OPTION_NAME, $dismissed_duplicates );
+			// Refresh the page to reflect changes.
+			wp_safe_redirect( isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : admin_url() );
+			exit;
+		}
+	}
+
+	/**
+	 * CLI handler to search for duplicates and optionally store this info to be displayed in the admin panel.
+	 *
+	 * ## OPTIONS
+	 *
+	 * [--cutoff_time=<time-string>]
+	 * : The cutoff time in the past (e.g. "2 months").
+	 *
+	 * [--save]
+	 * : Whether to save the results for display in the admin panel.
+	 *
+	 * ## EXAMPLES
+	 *
+	 *     wp newspack detect-order-duplicates --cutoff_time='2 months' --save
+	 *
+	 * @param array $args Positional args.
+	 * @param array $assoc_args Associative args.
+	 */
+	public static function cli_upsert_order_duplicates( $args, $assoc_args ) {
+		$cutoff_time_str = isset( $assoc_args['cutoff_time'] ) ? $assoc_args['cutoff_time'] : '1 month';
+		$cutoff_time = strtotime( $cutoff_time_str ) - time();
+		$save_as_option = isset( $assoc_args['save'] ) ? $assoc_args['save'] : false;
+
+		$duplicates = self::check_for_order_duplicates( $cutoff_time, $save_as_option, false );
+
+		if ( empty( $duplicates ) ) {
+			\WP_CLI::success( 'No duplicate orders found.' );
+		} else {
+			\WP_CLI::success( sprintf( '%d duplicate order series found.', count( $duplicates ) ) );
+		}
+	}
+}
+
+WooCommerce_Duplicate_Orders::init();