An invoice will be sent to you early in each month if you have sent invoices for a total in excess of SEK 100. If the total cost does not reach SEK 100, we will instead send an invoice to you for the month when your billing exceeds SEK100 or we will send you a quarterly invoice. When we send an invoice, we will use the invoice method of sending an email, and then a postal copy of our invoice. That is, an email message with the invoice is sent to you, and if this is not read within two days, a postal letter will be sent to ensure that you read the invoice. Every first-time registration entitles you to send free invoices for 30 days.