Helper

helpe.php

<?php

	public function prevent_duplicate_error_notices( string $message ): ?string {
		if ( wc_has_notice( $message ) ) {
			return null;
		}

		return $message;
	}

	public function wc_add_wp_error_notices( \WP_Error $errors ): void {
		add_filter( 'woocommerce_add_error', [ $this, 'prevent_duplicate_error_notices' ] );
		wc_add_wp_error_notices( $errors );
		remove_filter( 'woocommerce_add_error', [ $this, 'prevent_duplicate_error_notices' ] );
	}