// sync across devices
https://*.quizlet.com
3.0 API
https://play.google.com/store/apps/details?id=com.quizlet.quizletandroid
https://itunes.apple.com/us/app/quizlet-flashcards/id546473125
help.quizlet.com (zendesk)
get.quizlet.com
api.quizlet.com/2.0