Which innovative retail transformation did the White House Gift Shop undergo in 2018 that revolutionized its business model?

The White House Gift Shop, despite its name, is not actually located within the White House and has an interesting ownership history. Originally established to serve Secret Service personnel, it has evolved significantly over the decades. In 2018, a major transformation occurred that changed how this government-affiliated retail operation functions. Test your knowledge about this unique intersection of government and retail innovation!

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It became the first government retail entity to accept cryptocurrency as payment
It transitioned to a membership-only retail model requiring government clearance
It implemented a pioneering AI-based inventory system developed by the Department of Defense
It launched a classified biometric authentication system for purchasing presidential memorabilia