Method: Check if a product is on backorder.

Method: Returns whether or not the product has enough stock for the order.

Method: Returns whether or not the product has any visible attributes.

Method: Returns whether or not the product can be backordered.

Method: Returns whether or not the product needs to notify the customer on backorder.

Method: Returns whether or not the product can be purchased.

Method: Checks if a product needs shipping.

Method: Returns whether or not the product is taxable.

Method: Returns whether or not the product shipping is taxable.

Method: Returns whether or not the product is stock managed.