I can see many related questions on SO, but none that answers exactly what I'm confused with.
I'm using Google Calendar API in a .NET desktop application that allows user to provide his/her username/password, logs in on his behalf and adds some events to the calendar. Now I want to do exactly the same thing for Tasks feature. I'm trying to use Google Tasks API for this, but have been told that I need to do some OAuth kind of authentication, and even before that, I need to go to my gmail account and set permissions and get my project "key" to enable it.
Now does every user of my application need to do these steps in their Gmail account? Or do I need to do this in MY gmail account once and then my application code will be able to use the generated project "key" to enable my users to add tasks to THEIR gmail tasks list?