Shopify/active_merchant — pull request #1031 by bslobodin (2014-02-11 16:16:01+00:00)
Title: Change Conekta gateway to use :login instead of :key

This brings Conekta in line with the other gateways for compatibility reasons. Note, this is a re-packaging of #1025 to clean up the noise I introduced by mistake to its history.

To review: @emilienoel @amassaad @RichardBlair. Cc: @Shopify/payments.