Meses Sin Intereses - Tokenization instead of direct card processing

[leofischer]

@emsedano is reporting an issue in which MSI is not correctly processing though other forms of payment work fine. As I understand, the card is being tokenized instead of being processed directly in the page.

His specs are:
ruby 1.9.3p470 (2013-09-02) [x86_64-darwin12.3.0]
rails (3.2.14)
gem 'spree_auth_devise', :git => 'https://github.com/spree/spree_auth_devise.git', :branch => '2-0-stable'
gem 'spree_i18n', :git => 'git://github.com/spree/spree_i18n.git', :branch => '3-0-stable'
gem 'spree_conekta', :git => 'git://github.com/crowdint/spree_conekta.git'

Is the master the correct branch to use for MSI?
Thanks,

-Leo