I do have the following issue, I want to create a script in node.js which will recursively synchronize the photos from Pictures/
folder into my google photos account. And at the moment my issue is how should I approach it cause I didn't find any google photos api.
Back in the day it was possible to do the call directly to plus (before the lock down of the v1whitelisted
API to only registered clients, so this doesn't seem to work anymore unless you violate Google's ToS)
The only available API for Google Photos is the Picasa Web Albums Data API
So you can maybe use something like the nodejs picasa api client
You can also experiment by looking over the Protocol Guide
You can further experiment by using the OAuth 2.0 Playground through the Picasa API.
Good Luck :)