You can setup minimum and maximum Total Order values in Global Settings

- Open shop in Shopfactory

- Click Settings menu and select Global Settings

- In the Section marked Set Purchase Price - Minimum and Maximum, specify the Minimum order amount you will accept.  If you don’t want to set a Maximum enter a large number such as 999999.  Then Click the Ok button.

If I set minimum as $20 and Maximum as $999999 and I try to order $5.00 the following will occur at checkout