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HI Shanta,As per the latest documentation (https://developer.salesforce.com/docs/atlas.en-us.240.0.api_rest.meta/api_rest/openapi_beta.htm) (V56.0), the Supported Editions section says , "This beta feature is available to Developer Editions, Partner Developer Editions, sandboxes, and scratch orgs that have API Enabled."There is no mention of production org. At the moment, Only OpenAPI version 2.0 is supported. You will have to adjust your schema to conform with version 2.0 of the OpenAPI specification.There is no mention of ETA on OpenAPI 3.0 availability in any public-facing docs.Related: https://help.salesforce.com/s/articleView?id=sf.enhanced_external_services_considerations.htm&type=5https://ideas.salesforce.com/s/idea/a0B8W00000GdWGeUAN/external-services-openapi-30-supportIf this information helps, please mark the answer as best. Thank you