Abstract: Techniques are described for use in selectively authorizing proposed transactions under certain circumstances, such as when payments for the transactions are not assured. In some situations, when payments to a merchant from customers are not assured for proposed item acquisition transactions involving those customers, determinations are made to authorize and proceed with at least some of those proposed transactions in an automatic and selective manner without the assurance of receiving the payments for the selected transactions. For example, a selective determination of whether to authorize a proposed transaction may be made based on analyzing information about the proposed transaction (e.g., about the item(s) involved in the transaction, a payment amount of the transaction, the customer(s) involved in the transactions, etc.) and on information regarding other prior transactions.