You can issue a one-time invoice to a customer who has an existing contract. The invoice will use the payment data of the underlying contract. This means that the customer does not have to enter payment data again or confirm the payment for the one-time invoice and the stored payment method is charged.
To issue a one-time invoice, go to the "Customers" tab and click on the contract ID of the customer.
Go to "Perform Action" in the contract details and then select "Manually Create invoice".
You can now enter all the necessary invoice information in the "Create invoice" menu. If you want to list several invoice items, you can extend the invoice by clicking on "Add Row". Click on "Send". The invoice will be created and send.
The end date selected under Period of Service is not included in the service period. For example, if you select the 31st of a month, the service period ends on the 30th at 23:59. This date is also output in the document.