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Some time ago, I was asked where I put I/O operations when dealing with aggregates. The context was a CQRS and Event Sourced architecture, but in general, the approach that I prefer also applies to most imperative ORM entity code (assuming a proper data-mapper is involved). Scenario Let's use a practical example: Feature: credit card payment for a shopping cart checkout Scenario: a user must be able to check out a shopping cart Given the user has added some ...