Discussions showed the firm decided not to implement certain safeguards as it might affect overall revenues from people paying for games.
The information had been kept under seal, until the Center for Investigative Reporting recently made a request for them to be made public.
The files show discussions between Facebook employees about how in-app payments were occurring within the platform, and whether children might be unwittingly spending real money during games.
The term typically refers to instances when parents discovered a child has been using their credit card to buy features or add-ons in a game.
While Facebook did not develop the games in question, payments were made through its system which, at the time, did not have additional measures in place that required parents to re-verify card use if a child was spending more money.
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