Login into your PayPal Business Account
First you will need to go to PayPal and to Login into your PayPal Business Account.
PayPal My Selling Tools
After you login go to Profile -> Profile and Settings -> My selling Tools -> API access -> Click on the Update link.
Request API credentials
After you click on the “Update” link you will see the Request API credentials page. You will need to click on “Set up PayPal API credentials and permissions”.
PayPal API Access
On the PayPal API Access page you will need to click on NVP/SOAP API integration -> View API Signature.
Inside the View API Signature page you will see your PayPal Live API Keys.
Enable Express Checkout
Being on the PayPal API Access page you will also need to enable the “Express Checkout” feature. To achieve this click on the “Enable Express Checkout” link -> Select “Accept PayPal payments before API permissions or credentials are set up” -> Submit.
Copy and Paste the PayPal Standard Live API Credentials
After you copy the PayPal Standard Live API Credentials go to your website -> Dashboard -> Paid Member Subscriptions -> Settings -> Payments -> Payment Gateways -> PayPal Standard and paste your PayPal Standard Live API Credentials and click on “Save Settings”.