On your dashboard click on ¨Settings¨.
Under the heading “Company Settings”, click on the “Invoicing” option, as shown in the following image:
In the field “Invoice Configuration”, you can enter the number of “Days to Expiration” of your invoices.
In addition, if you wish to send notifications to your clients prior to the expiration of the invoices, select the boxes and indicate how many days in advance the notifications will be sent.
Once you have completed the information, click on “Save”.