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I have read many articles as how to expose the Apex class as a REST API or call the external REST API from Apex. How does OpenAPI (fka Swagger) work with Salesforce in inbound or outbound Rest API calls.

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A service that lives outside of Salesforce and documents its APIs via OpenAPI (formerly Swagger) specification can be consumed by Salesforce in a somewhat automated fashion. The creation of the client calling this service from the Salesforce platform and the callout itself must be done in a very specific way, via a framework that Salesforce refers to as External Services. Apex REST is for inbound (to Salesforce) calls. OpenAPI is not available in an automated fashion via Salesforce platform as a documentation format for Apex REST services (upvote this idea)

See External Services docs and/or trailhead for more info.

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