How to Activate Users
You can change a user's status from Invited to Active to reflect that they have used their invitation code code and are actively participating in your beta. This is a great way to identify users who have actually accepted the invitation to your beta. Also, checking in a user each time they log into your site is a great way to track visits and retention over time.
Option 1: Install a Tracking Pixel
<img height="1" width="1" alt="" style="display:none;" src="https://i.prefinery.com/projects/PROJECT_UID/users/checkin.gif?email=EMAIL" />
Be sure to replace both PROJECT_UID and EMAIL with the UID of your project (found on the General Project Settings page available via the Settings -> Project Settings menu in the upper-right corner of the page) and the email address of the user to activate, respectively.