stdClass Object ( [Timestamp] => 2024-03-28T15:55:49Z [Ack] => Failure [CorrelationID] => c12228bf3d8b8 [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] => 58322870 )