Originally Posted by
seigex
you don't have to show your certificate to board or to enter, just submit the high quality black and white copy to Visit Japan Web. Also, they will accept QR codes if you have one, for example CVS gave me a QR code that covered both my J&J shot and booster by logging in to their website.
Not sure about other states, but yes to this - for us in CA, you can register and all doses and dates administered are recorded as part of your Smart Health Card (personal digital covid 19 vaccine record)