Why Communications Deserve Their Own Service in Larger Applications

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Most applications send notifications such as order confirmations, password resets, and shipping updates, usually starting with a simple email client call. For small systems this approach is often sufficient, but larger applications with separate business contexts need more deliberate design. Microsoft's .NET eShop reference application, split into Ordering, Identity, and Payment services that communicate through contracts, is used as the example. A new series adds a dedicated communications service to eShop, starting with an analysis of where that service's boundary should lie. The article argues that a message often needs data spanning several bounded contexts, so no single existing service naturally owns it.

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