Restoring Purchases, namely in-app gold and Chip purchases, is a feature included in all three Infinity Blade games. In Infinity Blade I and II, simply navigate your way to the options menu and select "Restore Purchases". In Infinity Blade III, purchases should be restored automatically due to the ChAIR Cloud Save feature, but if they are not then you will have to file a Customer Support ticket. To do that, navigate your way to the Help section of the Options menu, then select Customer Support and fill out the requested information.