+- authorization and order_number (NEWLY DOCUMENTED IN 3.01):
+
+ Gateways will return one or two values from Authorization Only and
+ Normal Authorization transactions that must be submitted back with a
+ Post Authorization, Void, or Credit transaction.
+
+ If the gateway returns one value, return this as "authorization"
+
+ If the gateway returns two values, return one as "authorization" and the
+ other as "order_number". Typically "authorization" is the more low-level
+ value returned from the underlying processing network while "order_number"
+ is a unique tranaction id generated by the gateway.
+