public function set_parent_data( $parent_data ) {
		$parent_data = wp_parse_args(
			$parent_data,
			array(
				'title'              => '',
				'status'             => '',
				'sku'                => '',
				'manage_stock'       => 'no',
				'backorders'         => 'no',
				'stock_quantity'     => '',
				'weight'             => '',
				'length'             => '',
				'width'              => '',
				'height'             => '',
				'tax_class'          => '',
				'shipping_class_id'  => 0,
				'image_id'           => 0,
				'purchase_note'      => '',
				'catalog_visibility' => 'visible',
			)
		);

		// Normalize tax class.
		$parent_data['tax_class'] = sanitize_title( $parent_data['tax_class'] );
		$parent_data['tax_class'] = 'standard' === $parent_data['tax_class'] ? '' : $parent_data['tax_class'];
		$valid_classes            = $this->get_valid_tax_classes();

		if ( ! in_array( $parent_data['tax_class'], $valid_classes, true ) ) {
			$parent_data['tax_class'] = '';
		}

		$this->parent_data = $parent_data;
	}