I am a bit late to this project, but hope someone reads this to offer some suggestions. I have the hardware together (the screen and the raspberry pi) and have installed all the updates and have the Magic Mirror installed and updated. I have created the OAuth Client ID with TVS and Limited Input Devices and named the client TV Client 1 like in the instructions. I generated the credentials (which appeared to work) and renamed them and placed them in the MagicMirror/modules/MMM-GooglePhotos folder. I then CD'd to the correct folder and issued the node generate_token.js command and got the following error message:
TypeError: cannot read property '0' of undefined /home/pi/MagicMirror/modules/MMM-GooglePhotos/Gphotos.JS:133
The above error is repeated with variations. I re-ran the OAuth a few times and even went so far to include the API for googlephotos, but nothing seemed to work. Any suggestions/hints would be gratefully accepted!!
Geof