No. You don’t need an SSL certificate to use the WooCommerce PayPal Advanced Payment Gateway Extension.
However, there are two reasons you might want to get one anyway:
- Extra level of security for your website as a whole
- Avoid customers getting ‘mixed content’ warnings from their website browser. Any time your customers see a browser warning, it creates question marks in their heads. This might impact your site’s credibility for first-time visitors.