If you using PayPal as your payment gateway, then you might need your PayPal API details (especially to process refunds from your WooCommerce store).
Step 1 – Log into PayPal
Step 2 – Click on Profile > Profile and settings
Step 3 – Click on Selling Tools and on the next screen locate API access and click on the corresponding Update.
Step 4 – Locate the NVP/SOAP API Integration section and click on View API Signature
Step 5 – Show and copy the API details