Kindly ensure the following:
- The site is running on HTTPS with an active SSL certificate.
- Also, ensure that the stripe API credentials entered are correct and in the right fields.
Follow the steps given below to add the API credentials:
- Go to WooCommerce > Settings > Payments > PayPal Express. Enable the gateway and click on Manage.
- Input the PayPal API credentials in the field provided.
- To get the API credentials:
- Log into your PayPal business account.
- Click Activity near the top of the page and select API Access.
- Scroll down to NVP/SOAP API Integration (Classic) and click Manage API Credentials.
- Create keys if not done already. Else, copy the API Username, API Password, and Signature and paste it into the respective fields of the plugin.