What is the difference between?
Please anyone can help me on this?
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Nominal Item : After recurring profile is enabled for a particular product, then that product becomes a nominal item.
Nominal items have the following qualities.
As per this file getAllNonNominalItems() is no longer available in magento 2.X to use.
getAllVisibleItems() will return all product which doesn't have any parent product. It returns a product with one condition check
if(!$item->getParentItemId()) so product which don't have parent Id will be return by this method.