Send bills through Digiteal from your Google Sheets.
The plugin enables small EU companies to send their bills to their customers. It is provided with a template billing spreadsheet that enables them to manage their clients and their bills (https://docs.google.com/spreadsheets/d/1qefASkYt0u3oqnR5TX3iIaAOnmzZ_0ti3RrLB9UGewk/edit?usp=sharing).
Here is what happens to a bill when you send it:
1) A QR code is added on the bill to enable the customers to view their bill online.
2) The bill is sent in PDF through Digiteal or via email to the customer.
3) The bill is stored in PDF in your Google Drive.