To pass parameter in App URL, you need to find App URL first as below:
- Login to PowerApp web portal. Click on your app under Apps.
- Scroll to bottom of page under Details tab to find Web Link. Make a note of App ID.
Copy your Web Link which will be in format https://apps.powerapps.com/play/App ID would be GUID value of your app,
To pass any parameter to PowerApps, simply just add the '?' symbol after the url and '&' to separate the parameters. That's it!
To use the parameter variable in PowerApps.
Simply use the Param function.