Issue
When you set up the Google Play: Reply to Reviews Integration, you get a 403 access_denied error during the step where you click on "Get this code here".
Solution
This can happen when the wrong Google account is used for authorization. Please check whether you're logged into a different account in Chrome, or if you have several authorized Google accounts in your browser. If you're unsure, you can try setting up the integration in a different browser or in the incognito mode of your current one.