Mobile phones are starting to take on a role in payment, wearables too look to have a role to play in payment. the two stand out wireless technologies here are Bluetooth low energy and NFC. both Bluetooth low energy and NFC have complimentary strengths and have a strong use case for being used in conjuction for retail payment. the nRF52840 and nRF52832 have Bluetooth low energy and NFC on chip. nRF52840 has the ARM CryptoCell crytographic accelerator and is a very compelling candidate SOC for inclusion in designing a secure wireless POS terminal.