A QR Action is a great way to share an app person-to-person, and it's the easiest action to create since the app's QR code is automactically created.
Just choose the action's format and you're done. The default mode is to leave the URL field blank and the generated QR code will automatically be for the host app.
Tap the action to see a larger version of the QR code.
If you add a URL or other text string in the URL field, then a QR code will be generated to match that string.
Marketing use case to capture phone numbers from contacts: The QR code format to launch a text message from the scanning phone is: "SMSTO:number: text message" Thus for, if your mobile number is 555-555-1212 and your app URL is https://pwa.to/myapp, then add the string:
SMSTO:5555551212:Let's connect! https://pwa.to/myapp
to the QR field and you will get a QR code that, when scanned by a prospect, will launch a text message back to you and leave you both with each other's phone number and with a link to your app.
Payment QR: Add your Venmo payment URL to easily display your Venmo QR for payment.
As with most other actions, you can customize the call-to-action and its format.
Reference the Action Formatting and Controls FAQ for a refresher on the controls that are common to Actions.