What is a Collection?
It functions the same as Steam's bundle feature.
You can register a bundle of Games or DLCs released by the same group as a Collection Product, and apply a discount or sell as a set without a discount.
β» Collection discounts can only be set for specific periods. (Always-on discounts are not supported)
If any individual product in a collection is on sale, the collection discount and the individual discounts are applied together. (See image below)
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You can access the Collection page from the left panel.
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Collections are created per Group.