There are quite a few different places where you can change default text and options in your Vendio account. There is no specific area in Vendio where you would define when payment is due, but there are a few different places where you can put text that would tell your buyers when payment is due. You may be trying to edit the section that is located by going to "My Account" --> "Custom Listing Text" --> "Default Listing Text". If this does not help, please let us know if there is a specific string of text that you are trying to change. If so, please let us know that string of text.
