Hello
Is sharedFolderID permanently unchanged? Is it global?Is it possible to save the value and use it later or hand it to another user?
Shared folder IDs are global and stable for a given shared folder. You can store and re-use these values, even across accounts. The same shared folder will have the same shared folder ID across accounts of different members of the same shared folder.
The shared folder ID will only change if the shared folder is completely unshared (at which point it won't have a shared folder ID any longer) and then re-shared (at which point it will get a new, different shared folder ID).