public static function validate_and_sanitize( $event ) {
		$event = (object) $event;

		// Required.
		if ( ! $event->_en ) {
			return new WP_Error( 'invalid_event', 'A valid event must be specified via `_en`', 400 );
		}

		// Delete non-routable addresses otherwise geoip will discard the record entirely.
		if ( property_exists( $event, '_via_ip' ) && preg_match( '/^192\.168|^10\./', $event->_via_ip ) ) {
			unset( $event->_via_ip );
		}

		$validated = array(
			'browser_type' => WC_Tracks_Client::BROWSER_TYPE,
		);

		$_event = (object) array_merge( (array) $event, $validated );

		// If you want to blacklist property names, do it here.
		// Make sure we have an event timestamp.
		if ( ! isset( $_event->_ts ) ) {
			$_event->_ts = WC_Tracks_Client::build_timestamp();
		}

		return $_event;
	}