Depending on your birthday, you can download the enhanced vaccine certificate starting today. Today, you can get it if your birthday is within the period from January to April. Then you can print it or just put it on your device. It has a QR code which the business (that requires vaccination to enter) will scan to verify your vaccination status.
I had thought that we'd have an app for non-business persons but apparently, the app is just for businesses. I think there's missed opportunity there.
The other dates you can download along with the steps to get it are here:
https://covid-19.ontario.ca/proof-covid-19-vaccinationInteresting side note, the app is Open Source. Good on the government for doing that. Now it can be verified if the app is intruding on the privacy of users like keeping info. It's supposed to just verify your status and then discard your info.
I am wondering how easy it is to fake the information. But it only uses the QR code to compare your name, birthday, /health card number to the database online. So I'm more worried that somebody might hack that database. However, the ability to enter that information has been there since late Spring so I guess if that was happening, we'd know by now.