The Billing section is located in the Admin panel page, this contains an overview of all your invoices that is generated monthly for using Presail.

A list of unpaid invoices. An invoice is created on the 15th, with a seven-day due date.

If the status is unpaid, click on the invoice to see payment instructions on the specific invoice page.

A collection of your paid invoices, sorted by most recent first. The transaction hash that confirms the invoice payment will then be visible in the TX column.