How to create an Apple app-specific password [Bookedin to iCal sync]
Setting up an app-specific password is an extra step you need to do to use 3rd party tools like Bookedin appointments. Follow these steps and you'll automatically see all of your appointments sync from Bookedin to your Apple calendar (iCal) and vice-versa. Clients book online and their appointments will appear automatically in your personal iCal.
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https://bookedin.com/?cid=502