Structure of an Event message

Example Event

public class CustomerCreated : Event
{
    public readonly Guid AggreagteId;
    public readonly int Version;
    public readonly Guid UserId;
    public readonly Guid ProcessId
    
    // Other fields specific to this event
 
    public CustomerCreated(Guid aggregateId, int version, Guid userId, Guid processId)
    {
        AggreagteId = aggregateId;
        Version = version;
        UserId = userId;
        ProcessId = processId;
    }
}