A subscription grants a user access to a specific product through a product option. Each product has two defining elements:
Stock Keeping Unit (SKU): This is a unique identifier associated with each product. It is an alphanumeric code assigned to distinguish products from each other. There is a SKU and a SKU name defined for each product.
Purchase option (PO): This defines how a user can access or buy the product. Purchase options outline the specific terms and conditions under which a product is made available, such as the duration of access, payment intervals, and renewal options. There is a PO and a PO name defined for each product option.