In the current flow that is listed in the docs, the oauth session is initiated when our clients install the app. Is it possible to initiate the oauth session from our server? In theory, I believe this to be very simple. We would just use Weebly's authorize endpoint: https://www.weebly.com/app-center/oauth/authorize. The issue is that it is expecting a user_id which we do not have and I don't see anyway to find this in the admin site. Is this possible? How might we achieve this? Or find the user_id?