Visitors to the Nelson Mandela Memorial are directed to exit through the gift shop. Or, rather, Ye Olde Gifte Shoppe. Even though you won't find anything sensitive to snoop upon in their medicine cabinet, Chris and Alexa trust no one would dare shoplift from it. Swing open the door to find their tax license, as well as the 18 ye olde section, featuring ye olde bubble butt plug (a travel sized container of blowing bubbles that looks like it could double as a sex toy). They accept payment via their abacus outfitted with a credit card reader. 

Ye Olde Card Reader

Tabulating the balance.