What are API Signature or Certificate credentials?
API credentials identify you as a PayPal account holder authorised to perform API operations. There are two authentication methods to choose from:
- API Signature: A user name, password, and a unique string of numbers and letters are used to identify your account. API Signature credentials don't expire and are easier to implement and more commonly used.
- API Certificate: A user name, password, and a downloadable certificate are used to identify your account. API Certificate credentials are valid for three years, and you'll need to renew them before they expire. This method is recommended for optimal security.