Invoices are not sent automatically yet.
- PayPal or Stripe users may request an invoice to firstname.lastname@example.org
- Invoices for purchases made on Google Play store are available by following the steps below:
- Sign in to pay.google.com with your Google Account.
- Click on the transaction you want an invoice for.
- At the bottom of the transaction details, click Download VAT invoice.
- You may be asked to enter some information, like your full address or a tax ID.
- Click Save.
- You'll see a link where you can download your invoice.
Note: You can request each month's invoice in the first few days of the following month. It might take up to 24 hours to process your request.
source : Google’s support page