To automatically send your new emails to Optimizely Data Platform (formerly named Zaius), just follow these steps:

Step 1: Log in to your Optimizely Data Platform account.

Step 2: Go to your API access tokens by clicking on Account Settings (1.) > APIs (2.) > Switch to Private tab (3.) > Copy KEY (4.):

Step 3: Log in to your Wisepops account.

Step 4: Open or create a popup with a sign-up form.

Step 5: Click on your sign-up form.

Step 6: In the left menu, click on Sync, then Optimizely Data Platform:

Step 7: In the new tab, enter your Private API Key and click "Submit":

Step 8: In the "list" menu, choose which list you'd like new subscribers to join:

You're done :)