In [Azure Logic Apps](./logic-apps-overview.md), [REST](/azure/architecture/best-practices/api-design) is the default approach for connecting systems. As Microsoft and other software vendors expose RESTful services on top of their systems and data, Azure Logic Apps can expose and consume this type of information. The OpenAPI specification makes this capability possible for both humans and computers to understand the interaction between a client and server through metadata. As part of this understanding, both request and response payloads are derived, which means you can use dynamic content to populate a workflow action's inputs and use the outputs from the response in downstream actions.
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