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Four new promotion codes are available for versions 4.31+.

Here are the new scenarios:

When I buy X quantity of eligible products, the cheapest one is free
When I buy X quantity of eligible products, I get Y% discount on Z additional quantity
When I buy X quantity of specific products, then I get a Y% discount on those products
I can buy X quantity of eligible products for a set price

For more information, see: Promotion Codes Overview.