A sample use case
Consider an auction process. The basic auction process accepts new items for auction from a seller service, accepts bids from a bidder service, and identifies the winning bid in an auction service. All these operations require co-ordination between the services involved.
There may be concerns about the proprietary of some bids, but the time taken to validate the bid and ensure that it is legitimate may be viewed as too lengthy and instead it may be desired to have a background process to validate bids, so we do not slow down the normal bid taking process.
This is an extension to the business functionality that does not require a conversation between the bid process and the validation service. In fact, a conversation may slow down ...
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