Paypal has to have the most cumbersome site design around, you’ll also notice that the US/Canada and UK sites all have different site layouts which unfortunately the help documentation doesn’t update to reflect this.

To find you API Keys on the US site:

• Goto My Account
• Then Profile
• Then under Account Information, click Request API Credentials

Now you’ve got two choices, either Paypal standard API or Paypal Pro, if your using Paypal Express Checkout on your site choose the Paypal Standard API and click Set up PayPal API credentials and permissions.

Now finally click View API Signature

You will then be presented with the API credentials you need.