The External Service Gateway (ESG) pattern provides an anti-corruption layer between a cloud-native system and any external services that it interacts with. Each gateway acts as a bridge to exchange events between the system and a specific external system. In this recipe, we will create an ESG service that allows events to flow inbound from an external service. The single responsibility of this service is to encapsulate the details of the external system. The service exposes a RESTful webhook to the external system. The external events are transformed into an internal format and published using event-first Event Sourcing.
Implementing an inbound External Service Gateway
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