How to create API Details on your Dropbox account?
Step 1: Login to your Dropbox account using this URL
Step 2: Click API v2 --> Create your app
Step 3: Choose the options as shown in the below screenshot and then click Create App
You need to select Full Dropbox to access the Backups taken via InfiniteWP using Dropbox API v1
Step 4: Copy App Key, App Secret and OAuth Token and Enter the details on your IWP admin panel.