You should receive a monthly invoice from Paper.li for each paper that carries a paid subscription. This invoice will be generated each month on the day you signed up for the service. For example, if you signed up for the service on July 20, you will receive your invoice each month on the 20th.
If you have not received monthly invoice, please check your Spam or Trash folder.
If you would like a copy of an invoice in PDF format, you can access your account billing dashboard and download a copy.