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You definitely are on the right track considering from the comments/post I feel confident in assuming this is event based middleware. The life cycle of this process would involve the two event emissions, as you stated, one to trigger the payment apps process and another once that has completed with success/failure, as far as the hanging request if your using ...


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If you need to perform two operations from different microservices in one transaction, this means that either both succeed or non of them is performed. If you do not want an event queue at all, this would mean that one of the microservices invokes the other in a synchronous manner. You would then have to foresee an API that enable the implementation of a ...


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I understand that you would prefer not to introduce a persistence mechanism to App-a. This answer will probably not be exactly what you are looking for. But IMHO, there are only a couple of ways that you can solve the problem, and both involve persistence. The problem at the end is simply that you need the system to be resilient. You would want to survive (...


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