Turn on email invoices

### Example URL(s)

https://developers.cloudflare.com/billing/manage/invoices/

### Actual Behavior

There is no "Billing email preferences" anywhere on the page.

### Expected Behavior

A way to turn on/off billing email preferences without clicking on an e-mail link.

### Additional information

I received an email stating that my invoice was ready. Instead of clicking on the link, I went to the bookmark of my account -> Manage account -> Billing -> Invoices and documents. There is a list of my previous invoices so that I could download the latest.

i was wondering how I could "Enable email invoices" as the email I received implied with a link. I didn't see any such option there. So I searched the documentation which led me to the above URL. That implied that I was on the right page, but I didn't see such an option.

Perhaps that's for the best. If you email me a link to the invoice, I'll wind up following the same path to download it manually anyway. And now that I think about it, I probably shouldn't click on an enclosed PDF either. Security is so difficult.