public function settings_save() {
		if ( ! is_admin() ) {
			return;
		}

		// We need to save the options ourselves; settings api does not trigger save for the permalinks page.
		if ( isset( $_POST['permalink_structure'], $_POST['wc-permalinks-nonce'], $_POST['woocommerce_product_category_slug'], $_POST['woocommerce_product_tag_slug'], $_POST['woocommerce_product_attribute_slug'] ) && wp_verify_nonce( wp_unslash( $_POST['wc-permalinks-nonce'] ), 'wc-permalinks' ) ) { // WPCS: input var ok, sanitization ok.
			wc_switch_to_site_locale();

			$permalinks                   = (array) get_option( 'woocommerce_permalinks', array() );
			$permalinks['category_base']  = wc_sanitize_permalink( wp_unslash( $_POST['woocommerce_product_category_slug'] ) ); // WPCS: input var ok, sanitization ok.
			$permalinks['tag_base']       = wc_sanitize_permalink( wp_unslash( $_POST['woocommerce_product_tag_slug'] ) ); // WPCS: input var ok, sanitization ok.
			$permalinks['attribute_base'] = wc_sanitize_permalink( wp_unslash( $_POST['woocommerce_product_attribute_slug'] ) ); // WPCS: input var ok, sanitization ok.

			// Generate product base.
			$product_base = isset( $_POST['product_permalink'] ) ? wc_clean( wp_unslash( $_POST['product_permalink'] ) ) : ''; // WPCS: input var ok, sanitization ok.

			if ( 'custom' === $product_base ) {
				if ( isset( $_POST['product_permalink_structure'] ) ) { // WPCS: input var ok.
					$product_base = preg_replace( '#/+#', '/', '/' . str_replace( '#', '', trim( wp_unslash( $_POST['product_permalink_structure'] ) ) ) ); // WPCS: input var ok, sanitization ok.
				} else {
					$product_base = '/';
				}

				// This is an invalid base structure and breaks pages.
				if ( '/%product_cat%/' === trailingslashit( $product_base ) ) {
					$product_base = '/' . _x( 'product', 'slug', 'woocommerce' ) . $product_base;
				}
			} elseif ( empty( $product_base ) ) {
				$product_base = _x( 'product', 'slug', 'woocommerce' );
			}

			$permalinks['product_base'] = wc_sanitize_permalink( $product_base );

			// Shop base may require verbose page rules if nesting pages.
			$shop_page_id   = wc_get_page_id( 'shop' );
			$shop_permalink = ( $shop_page_id > 0 && get_post( $shop_page_id ) ) ? get_page_uri( $shop_page_id ) : _x( 'shop', 'default-slug', 'woocommerce' );

			if ( $shop_page_id && stristr( trim( $permalinks['product_base'], '/' ), $shop_permalink ) ) {
				$permalinks['use_verbose_page_rules'] = true;
			}

			update_option( 'woocommerce_permalinks', $permalinks );
			wc_restore_locale();
		}
	}