Extending the existing promotions functionality can involve doing any one or more of the following:

The PMDL stores the discount information and ties together a set of target items with the discount that should be applied. PMDL allows you to include multiple targets and multiple discount structures in the same promotion, but the latter must all be the same promotion/pricing engine type.

For example, say you want to create another tiered pricing calculator to handle a special discount, such as free ground shipping.

If you add a new calculator type, you will most likely modify an existing calculator to support it, perhaps by adding a new method (see the Commerce Pricing Calculators chapter).

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