checkout everything abut vcardvault in the FAQ section or just watch the series on how to use vcardvault on YouTube:
how to login
https://youtu.be/9raojh9qRsQ
how to create your first vcard
https://youtu.be/cwzRSeZpI3k
how to create whtasapp store
https://youtu.be/C6rs9KEcoNM
how to create business cards(physical business cards)
https://youtu.be/QeYIuRAi90c
referral program(how to earn)
https://youtu.be/f_3Br7Vp0CM