Follow the steps below to identify which Salesforce Edition and API version your organization is using which is often needed when working with Salesforce Support, developers, or consultants.
To view these steps in an easy-to-follow video, please review the screencast: How to Find Your Salesforce Edition and API Version in Lightning.
Note: Apex classes are not available in a Live Production instance at this time. Only Developer Edition, Sandbox, and Trial Organizations have the ability to create, edit, and delete Apex classes and triggers directly in the Salesforce CRM user interface.
REST API Developer Guide - List Available REST API Versions
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