Lock App Features Behind a Paywall and Enforce the Lock in Code

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I stumbled upon an interesting coding problem in a recent macOS project related to in-app purchases. IAP can be represented by a feature option set in code. How do you secure UserDefaults access in such a way that accessing values can be locked via the IAP available feature options? (This also applies to tiered licenses, like a “Basic” and a “Pro” feature set.)

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