1 - do something about state_id / state_id_state (linkpoint, freeside) vs.
2 license_num / license_dob (authorize.net, docs here). wtf!
4 - hmm... requires HTTP::Headers v1.59
5 - move revmap_fields into the base class
6 - remap_fields: Not the cleanest thing to mix up our namespace with the
7 processor-specific names.
8 - Define a better model of exception handling that doesn't involve dying on