Once you signed up to neverbounce.com you'll arrive on the dashboard.
From there, click on Apps
Then hit CREATE NEW APP
Choose Custom Integration:
Create the application, give it a name and so on.
Then head back to Apps and choose your new app, you'll see the following:
Now go to Captain Data; to the integration tab and select Neverbounce:
Click on Connect a New Account:
Give your account a name and paste your API key 🗝
Save your account 👌