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In the process of assigning globally unique identifiers (GUIDs) to new website users, you're tasked with integrating a service that generates GUIDs based on input data. This data originates from both internal and external systems, accessed via HTTP calls made through microservices within your pipeline. With an expected throughput of tens of thousands of messages per second, potentially multi-threaded, you're concerned about mitigating backpressure on the system. How should you structure your pipeline to minimize backpressure?