Building the checkout service

We now have a service that manages the inventory stock of your small, fictional e-commerce venture. In the next step, we will now implement a first version of the actual checkout service. The checkout service will offer an API for completing a checkout process, using a cart consisting of multiple articles and basic customer contact data.

Using react/zmq

For this, the checkout service will offer a simple REP ZeroMQ socket (or a ROUTER socket, in a concurrent setup). After receiving a checkout order, the checkout service will then communicate with the inventory service to check if the required items are available and to reduce the stock amount by the item amounts in the cart. If that was successful, it will publish the ...

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