As of 03-16-2011, authorize.net has issued two new calls to the Transaction Details API, getUnsettledTransactionList and getBatchStatistics.
getUnsettledTransactionList returns up to 1000 outstanding transactions per call, returning the most recent transactions. The information returned in the response will be the same as in the getTransactionList call.
getBatchStatistics returns batch statistics for one batch, for example, calculation status and time, number of charges, number of drops, etc.
For more information, see the XML Guide and the SOAP Guide.
At the time of writing, the PHP SDK is in version 1.1.6 and does not have this feature built into the TD api, however, if you look at the documentation above and also this example page , you will see that getting a list of outstanding transactions is actually possible .
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