Get contents of a shared folder

I believe there are a few different factors that determine the paging, so you should just make sure your app always checks and follows the has_more and reset indicators to make sure it's always working from correct data.

And yes, Dropbox will send webhook notifications for any changes in the linked accounts. Your process sounds right for the most part, but be careful managing concurrency when you receive multiple notifications for the same user. There's a note about this at the bottom of the documentation here:

https://www.dropbox.com/developers/reference/webhooks

You may also want to "debounce" the calls you make in response to webhook notifications. I.e., wait a certain amount of time after receiving a webhook notification for a user before making the delta call, in case there are more webhook notifications coming in anyway.