Micro-transactions

What is a Micro-Transaction?
The wikipedia definition is as follows:
 * A micropayment is a financial transaction involving a very small sum of money and usually one that occurs online.

In short - Firefall will be a free-to-play game with micro-transactions the full details of which are yet to be provided. However the item store (as it is also referred to as in other games) will not contain any gameplay changing purchases. IE: battleframes etc. Merely cosmetic upgrades and possible XP boosts etc.