The IOrderCalculator interface allows you to do every calculation related to the order by yourself. Although this is not a trivial task to do (to take over calculations), it gives you the flexibility to do anything you want with the calculation mechanism.
NOTE: Using a custom implementation of the IOrderCalculator interface overrides the build-in calculations done by the Ecommerce module. This means you have to perform all the calculations by yourself.
To create a custom order calculator, you must perform the following:
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