Acceptgiro’s (transaction forms) are a widely-accepted method of payment in the Netherlands and have been used by businesses and domestic users for decade. It is based on a paper acceptgiro form, which is made available by a creditor (usually a business), but nowadays it can be used for online banking too.
Bills are generally paid by bank transfer. You receive an invoice and an acceptgiro form from the company concerned, sometimes with the payment details already filled in. You add your signature and fill in the number of your bank account and mail the form back to your bank. You can also drop your acceptgiro directly in the dedicated letterbox at the bank. Most people are now using it via internet banking.