Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Defining Your Custom Platform Event

Define a platform event and add custom fields.
Available in: both Salesforce Classic and Lightning Experience
Available in: Performance, Unlimited, Enterprise, and Developer Editions

User Permissions Needed
To create and edit platform event definitions: Customize Application

AND

API Enabled