User blog comment:Bovell/"Call of Duty: Project Colossus" = Modern Warfare 3? + Micro-transaction Call of Duty for China in the works/@comment-121.216.195.73-20110510035908/@comment-24.165.26.84-20110510042915

Means you pay a a very small amount at a time. In this case, its a game that could be like 99 cents for a payment, for example.