Please visit https://easyar.com/view/open/app.html, and click <Add Application>. Bundle ID should be the same with your App's Bundle ID.
After you add application, click <key> to get the license key.
More detail information, please visit https://easyar.com/doc/EasyAR%20SDK/Getting%20Started/Getting-Started-with-EasyAR.html#get-a-key