Select the WhatsApp QR code type;
Enter the phone number with the correct country code. The text of the message can be entered as desired;
Click Customize & Download QR;
Create your own code design and click Download QR Code.
For example, you want a QR code with your number not to be used by people who are in another city. In this case, you can set a limit on the card. Thus, only those within that range will be able to view the information
No, you can't, as the WhatsApp scanner only detects QR codes generated in the app itself.