WooCommerce 10.5.1 Update: Why Your “Add to Cart” Button Broke
The WooCommerce 10.5.1 update is a critical patch fixing broken “Add to Cart” buttons for variable products and resolving PHP warnings in the Divi theme. This release also hardens PayPal Standard security with token-based validation for shipping callbacks. If your store’s checkout broke after the 10.5 update, this is the mandatory fix.