+Response code returned by InternetSecure.
+
+=item error_message()
+
+Error message if the transaction was unsuccessful; C<undef> otherwise. (You
+should not rely on this to test whether a transaction was successful; use
+B<is_success>() instead.)
+
+=item receipt_number()
+
+Receipt number (a string, actually) of this transaction, unique to all
+InternetSecure transactions.
+
+=item sales_number()
+
+Sales order number of this transaction. This is a number, unique to each
+merchant, which is incremented by 1 each time.
+
+=item uuid()
+
+Universally Unique Identifier associated to this transaction. This is a
+128-bit value returned as a 36-character string such as
+C<f81d4fae-7dec-11d0-a765-00a0c91e6bf6>. See RFC 4122 for more details on
+UUIDs.
+
+B<guid>() is provided as an alias to this method.
+
+=item authorization()
+
+Authorization code for this transaction.
+
+=item avs_response() / cvv2_response()
+
+Results of the AVS and CVV2 checks. See the InternetSecure documentation for
+the list of possible values.
+
+=item date()
+
+Date and time of the transaction. Format is C<YYYY/MM/DD hh:mm:ss>.