In billing library 3, a single Purchase is associated with single sku
purchase.getSku()
However, in billing library 4 and 5, a single Purchase is associated with multiple sku/ multiple products
purchase.getSkus()
purhcase.getProducts()
Does anyone know, what does it really mean by a single Purchase is associated with multiple skus/ multiple products? How can a user perform single purchase operation, and ended up with multiple paid items?