My understanding is that the Google Picker can be used to select "Picasa" photos and albums. However, since the Picasa API has now been shutdown, the ids returned by the picker are completely useless (at least as far as doing anything with the returned IDs goes).
There is a Google Photo API but I'm not aware of a Picker that returns IDs compatible with it.
So, does anyone know of a way to use the (very pretty and functional) Google Picker (technically for Picasa but still shows Google photo albums) with the Google Photos API?
Perhaps some way to exchange the Picasa IDs for new Google API ones?