No `oauth/authorize` API equivalent

Is there a way to call the `oauth/authorize` API within this lib? Didn't find it in the source.

When trying to create an event, I get a 403 error. Based on the doc https://docs.cronofy.com/developers/api/events/upsert-event/#status-403 I need to request auth again.

Maybe am missing something.

Thanks for your input!