Primary use of this field is on the user side. It is submitted
with the payment and the user can have categorized view of the
charges on his/her credit card.
For the checkout with a mix of goods and services, please use
your best judgment. For example, if you charge $100 for goods
and $10 for services, then type should probably be "GOODS".
Otherwise, if $10 is charged for goods and $100 for services,
then type should be "SERVICE".
Hope this helps!
Aleksey
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Aleksey Sanin
WePay | VP of Engineering
650-450-1321
WePay Adds Customizable Invoicing: http://tcrn.ch/w3E9GM