stdClass Object ( [Timestamp] => 2025-07-30T19:28:02Z [Ack] => Failure [CorrelationID] => ff3fec430d1fd [Errors] => stdClass Object ( [ShortMessage] => Line items missing. [LongMessage] => Line items missing; line items are required when you specify a callback URL for flat rate shipping options. [ErrorCode] => 11827 [SeverityCode] => Error ) [Version] => 121 [Build] => 000000 )