Fix undefined $helper_auth_data warning in get_wc_helper_auth_info() (#2960)

Initialize $helper_auth_data to false before the WC_Helper_Options guard
so the falsy check on line 36 does not read an undeclared variable when
the helper class is unavailable (e.g. during cron).

Reported on wp.org: https://wordpress.org/support/topic/minor-php-bug-undeclared-variable/
WOOTAX-293

Author: samnajian

changelog.txt

@@ -1,5 +1,8 @@
 *** WooCommerce Tax Changelog ***
 
+= 3.6.5 - 2026-xx-xx =
+* Fix   - Prevent PHP "undefined variable" warning when WooCommerce Helper authentication data is unavailable.
+
 = 3.6.4 - 2026-06-01 =
 * Dev   - Update JS dependencies.
 

classes/class-wc-connect-functions.php

@@ -28,6 +28,7 @@ public static function should_send_cart_api_request() {
 		 * @return array|WP_Error
 		 */
 		public static function get_wc_helper_auth_info() {
+			$helper_auth_data = false;
 			if ( class_exists( 'WC_Helper_Options' ) && is_callable( 'WC_Helper_Options::get' ) ) {
 				$helper_auth_data = WC_Helper_Options::get( 'auth' );
 			}

readme.txt

@@ -70,6 +70,9 @@ This plugin relies on the following external services:
 
 == Changelog ==
 
+= 3.6.5 - 2026-xx-xx =
+* Fix   - Prevent PHP "undefined variable" warning when WooCommerce Helper authentication data is unavailable.
+
 = 3.6.4 - 2026-06-01 =
 * Dev   - Update JS dependencies.