public static function product_add_to_cart_url( $atts ) {
		if ( empty( $atts ) ) {
			return '';
		}

		if ( isset( $atts['id'] ) ) {
			$product_data = get_post( $atts['id'] );
		} elseif ( isset( $atts['sku'] ) ) {
			$product_id   = wc_get_product_id_by_sku( $atts['sku'] );
			$product_data = get_post( $product_id );
		} else {
			return '';
		}

		$product = is_object( $product_data ) && in_array( $product_data->post_type, array( 'product', 'product_variation' ), true ) ? wc_setup_product_data( $product_data ) : false;

		if ( ! $product ) {
			return '';
		}

		$_product = wc_get_product( $product_data );

		return esc_url( $_product->add_to_cart_url() );
	}