How to get the Licence key in AR feature?

Follow below mentioned steps get the Licence key in AR feature via Vuforia:

If you have created an account with Developer Vuforia, login, else Register
Once you are in Vuforia dashboard, select Develop tab, and click on Get Development Key button
Under Licence Manager, provide an App Name, and click on Confirm to continue.
Click your App Name under License Manager tab
Copy your License Key
Paste it into your Licence Key field given in AR

Disclaimer: All Aiprobuild users who intend to use the AR feature powered by Vuforia are requested to adhere by Terms of Use set by PTC Inc.(PTC), as mentioned on https://developer.vuforia.com/legal/vuforia-developer-agreement