We use karma to mean payback. In the Gītā, karma is action, and the wise are those who see inaction in action and action in inaction.
Going deeper
Karma is the word at the centre of chapter 4, and 4.18 is one of its sharpest uses. It says that a person who sees inaction in action, and action in inaction, is wise among people, is fit for release, and has accomplished all actions. The verse before, 4.17, prepares it: there is something to be understood about action, about wrong action and about inaction, and the way of action is hard to see. 4.19 says who the wise call a sage: one whose every undertaking is free from desire and wishful planning, whose actions are burned up in the fire of knowledge. Karma in the Gītā means action, not payback. The test is whether you can tell what is really happening when you act, and when you hold still. See chapter 4 and what the Gītā says about karma.