I need an invoice in .pdf format

See -> Viewing & Changing Orders - Shopping Help - Apple

⤵️

To view or print your invoice, go to your Order Listing

(Opens in a new window)

 page and select an item to go to the order details. Then, select View Invoice at the top of your order details page to access your invoice.

If you need help viewing or printing your invoice, speak with an Apple Specialist at 1‑800‑MY‑APPLE.

Check your mail box, search the invoice and download the invoice, select the option to save as . . .

Or ask the vpn company.

I tried but I can’t download it

What happens when you click on the invoice?

Then select the option to save as . . .

and the funny think is that this vpn company asked me for that invoice

You can also send an email to that vpn company and as attachment that invoice.

but is a plan that I bought 6 months ago

What do you mean with a plan?

Bought from . . . ?

iCloud+ subscription plan?