You will usually receive a pay-in slip with the invoice. You will need this to pay the invoice. It contains all the information you need, such as the name of the recipient, the account number, invoice amount, reference number, etc.
There are several ways to pay your invoice:
Over the counter at the post office. Hand over the completed pay-in slip and pay the amount in cash or by debiting it from your post office giro account. You will be given a receipt or an entry in your yellow post office account book every time you make a payment. You can also fill out a payment order and post it to your bank, together with the pay-in slip. Your bank will then transfer the money. Other options include e-banking, or using a mobile banking app or PostFinance app.
Payments are made easier by direct debits (DD) (Lastschriftverfahren - LSV) and standing orders (Dauerauftrag). This is a way to automatically pay recurring bills, such as rent, telephone, or health insurance fund. You can find out how to do this from your bank or the post office.