1. Log in to PayPal and navigate to the profile section on the top right of your page and click "Profile and Settings" section.
2. Your profile page will open, click "My Selling Preferences".
3. Within "My Selling Preferences" select "selling online". Next, select "API Access".
4. Then click "Manage API Credentials".
5. Now you will see three headings; API username, API password, and signature. Click "show" next to each to display your API details needed to take payments over WiFi.