[Deprecation][Orders API] order.gateway and order.payment_details This post is outdated
Due to the reality that an order having a single transaction for payment is no longer always true (point of sale, gift-cards, etc.) we are going to be deprecating the gateway and payment_details fields on Order.
All of this information can be found via the orders transactions which can be accessed by making an API request for that order. An example of such a request would be something along the lines of:
These changes will be coming in effect on November 1, 2014