23inhouse/active_merchant — comment on commit 1123ee78de713fa70841f4e5254478a6b6bf1c9e
File: lib/active_merchant/billing/gateways/card_access.rb line 197
By Cvg131072:

Again, this is the only place where MESSAGES are used. If MESSAGES used symbols as hash keys then the line could be translated to:
@message = [ MESSAGES [params['DE039'].to_sym].presence.......
Performance consequences would probably be minimal.