Each line of the goods file contains a class name, an attribute, and a value. As a result, names of attributes are restricted tokens and cannot be used in the names of your classes.
Attributes specify price, currency, access control, and other properties.
Currency The Currency attribute specifies the currency in which you receive payments. The value is the ISO currency code. NetBill does not support the concept of calendar months. Only subscription durations that are specified in the goods file are available for sale. In the above example, a user could not buy a weekly subscription because it is not offered.