You can follow below-given steps in order to retrieve the API key for your Pepipost account,

1. Login to your Pepipost Account.

2. Go to Settings -> Integrations - > API and click on  "Show" button as shown in below image,


Once done, you’ll be prompt to re-enter your account login password as a part of security verification and upon successful verification of login password API key will be displayed on the screen.