A Smart Transaction can have one of two basic operating modes, called intent:
order for purchase orders;
sale for payment without assuming a contract type.
An order requires an agreement about shipping or collection. The button for the conclosure has a different label (Buy Now! instead of Pay Now!). Incoming orders are found in SecuOffice under Orders » Completed.
Payments can be used for donation, crowd funding, or reservation fees, to name a few examples.