value returned from the underlying processing network while "order_number"
is a unique tranaction id generated by the gateway.
+
+- Moo (NEWLY DOCUMENTED IN 3.04)
+
+ Feel free to write gateway modules which use Moo. It would be appreciated
+ if you did not use features which required Moo newer than 0.091011 at this
+ time (2014 - 2018).