Go to https://www.paypal.com/ and click get started under the business account.
Enter the email address you want to use for your account and click continue.
Fill out your personal and business information.
Once in your dashboard go to your profile and select Profile and Settings.
Select my selling preferences, then click Update on API access.
Click Manage API credentials under NVP/SOAP API Integration.
Show and copy your API details.
Add the API details to the Payments section our editor.