public static function add_to_cart_action( $url = false ) {
		if ( ! isset( $_REQUEST['add-to-cart'] ) || ! is_numeric( wp_unslash( $_REQUEST['add-to-cart'] ) ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			return;
		}

		wc_nocache_headers();

		$product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( wp_unslash( $_REQUEST['add-to-cart'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$was_added_to_cart = false;
		$adding_to_cart    = wc_get_product( $product_id );

		if ( ! $adding_to_cart ) {
			return;
		}

		$add_to_cart_handler = apply_filters( 'woocommerce_add_to_cart_handler', $adding_to_cart->get_type(), $adding_to_cart );

		if ( 'variable' === $add_to_cart_handler || 'variation' === $add_to_cart_handler ) {
			$was_added_to_cart = self::add_to_cart_handler_variable( $product_id );
		} elseif ( 'grouped' === $add_to_cart_handler ) {
			$was_added_to_cart = self::add_to_cart_handler_grouped( $product_id );
		} elseif ( has_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler ) ) {
			do_action( 'woocommerce_add_to_cart_handler_' . $add_to_cart_handler, $url ); // Custom handler.
		} else {
			$was_added_to_cart = self::add_to_cart_handler_simple( $product_id );
		}

		// If we added the product to the cart we can now optionally do a redirect.
		if ( $was_added_to_cart && 0 === wc_notice_count( 'error' ) ) {
			$url = apply_filters( 'woocommerce_add_to_cart_redirect', $url, $adding_to_cart );

			if ( $url ) {
				wp_safe_redirect( $url );
				exit;
			} elseif ( 'yes' === get_option( 'woocommerce_cart_redirect_after_add' ) ) {
				wp_safe_redirect( wc_get_cart_url() );
				exit;
			}
		}
	}