unity iap: ios transactionid can not find

Sometimes I can not find "in_app" on the ios receipt data. I want to know the transaction ID of "in_app", which is an empty list.

This problem occurs after using unity iap. "Status" received normally.

• Question -

1. What if "in_app" is passed to an empty list?

2. If "in_app" is an empty list, should all be considered hacking?

-abnormal-

     'status': 0, 
 'environment': 'Production', 
 'receipt': 
 {
     'download_id': xxxxxxxx
     'adam_id': xxxxxxxx, 
     'request_date': 'xxxxxxxx', 
     'app_item_id': xxxxxxxx, 
     'original_purchase_date_pst': 'xxxxxxxx', 
     'version_external_identifier': xxxxxxxx, 
     'receipt_creation_date': 'xxxxxxxx', 
     'in_app': [],   
     'original_purchase_date_ms': 'xxxxxxxx', 
     'original_application_version': 'xxxxxxxx', 
     'original_purchase_date': 'xxxxxxxx', 
     'request_date_ms': 'xxxxxxxx', 
     'bundle_id': 'xxxxxxxx', 
     'receipt_creation_date_pst': 'xxxxxxxx, 
     'application_version': 'xxxxxxxx', 
     'request_date_pst': 'xxxxxxxx', 
     'receipt_creation_date_ms': 'xxxxxxxx', 
     'receipt_type': 'Production'
 }

-normal-

'status': 0, 'environment': 'Production', 'receipt': { 'download_id': xxxxxxxx, 'adam_id': xxxxxxxx, 'request_date': 'xxxxxxxx', 'app_item_id': xxxxxxxx, 'original_purchase_date_pst': 'xxxxxxxx', 'version_external_identifier': xxxxxxxx, 'receipt_creation_date': 'xxxxxxxx', 'in_app': [ { 'is_trial_period': 'false', 'purchase_date_pst': 'xxxxxxxx', 'product_id': 'xxxxxxxx', 'original_transaction_id': 'xxxxxxxx', 'original_purchase_date_pst': 'xxxxxxxx', 'original_purchase_date': 'xxxxxxxx', 'original_purchase_date_ms': 'xxxxxxxx', 'purchase_date': 'xxxxxxxx', 'purchase_date_ms': 'xxxxxxxx', 'transaction_id': 'xxxxxxxx', 'quantity': '1' } ], 'original_purchase_date_ms': 'xxxxxxxx', 'original_application_version': 'xxxxxxxx', 'original_purchase_date': 'xxxxxxxx', 'request_date_ms': 'xxxxxxxx', 'bundle_id': 'xxxxxxxx', 'receipt_creation_date_pst': 'xxxxxxxx', 'application_version': 'xxxxxxxx', 'request_date_pst': 'xxxxxxxx', 'receipt_creation_date_ms': 'xxxxxxxx', 'receipt_type': 'Production' }