Easy lang yan, usually sa mga ganito via QR and NFC tags, pero meron din yung mga app based pero mas prefer ko yung NFC.
Sa QR, you literally just upload a photo of your business card to an image hosting sites, then copy link lang tapos paste mo sa QR Generator, then share the QR code nalang sa mga gusto mo bigyan ng copy ng card mo.
NFC, if you wear any accessories that can broadcast RFID/NFC, napaka dali mag share nito if you're talking to the person personally and exchange business card, but i think parang "why complicate it when its working" thing, since nag meet naman na kayo, why not give a physical business card nalang instead of just sending it electronically pa, well, cool siya i operate tho. HAHA
ang siste is almost same with QR, just upload the image of your business card, or even your website link if you have, then copy link, sa pag upload naman sa NFC device, capable na mostly lahat ng mid range phones ngayon na mag read and write ng NFC Cards or Chip, i personally use the app "NFC Tools" to write it on my nfc device.
I suggest the NFC ring, singsing siya na pwede maka broadcast ng NFC, so pag may nanghingi ng digital business card mo, just tell them to open their NFC Scanner sa Phones, then put your finger with the ring nearby the phone then voila, they will automatically redirected to your digital business card, pero kung di mo bet, you can just buy a NFC card, around 20php lang yata isa non, then ikaw na bahala mag design sa outside ng card mo, i suggest you use sticker na ginagamit sa pag customize ng credit cards, same size lang sila, you can just put it out and use the nfc card, nakatipid ka sa papel. HAHAHA
Lastly is the app based, marami ako nakikita na ads about this but i havent tried kasi napaka OP (for me since i know how it works haha) and not worth it to pay for.