As technology continues to advance in the restaurant and retail industry, your clientele's use of technology also advances. I'd say that the majority of individuals under 40 years old have heard of Apple Pay and/or Google Wallet and probably a large portion have actually used it before. This is especially important if your target clientele is in this age group, because most spend their time glued to their smartphone.
If you have never heard of Apple Pay or Google Wallet, then here is a brief explanation of what this technology is and what it can do. Apple Pay and Google Wallet are apps developed to accept Near-Field Communication (NFC) or "Contactless" payment transactions using an app on your smartphone. Apple Pay is the leading giant, but others such as Google Wallet, Samsung Pay, and Android Pay are all available depending on your smartphone brand. This technology allows a user to add their payment card information securely to their smartphone and when establishments offer payment devices that accept NFC payments, then the customer will simply "hover" their phone over the payment device and the transaction will process using the NFC communications without ever having to pull out their wallet.