No password in status update notifications

Hi,
We'd like to use status update notifications, We have configured our server and added proper url to Subscription Status URL in our account. Now we test it in Sandbox environment and we get some notifications from Apple that look like this:

{
'auto_renew_product_id': 'SOMETHING',
'users': 'SOMETHING',
'auto_renew_status': 'SOMETHING',
'environment': 'SOMETHING',
'latest_receipt': 'SOMETHING',
'latest_receipt_info': {
       'transaction_id': 'SOMETHING',
       'bid': 'SOMETHING',
       'expires_date_formatted_pst': 'SOMETHING',
       'expires_date': 'SOMETHING',
       'unique_vendor_identifier': 'SOMETHING',
       'original_purchase_date': 'SOMETHING',
       'purchase_date_pst': 'SOMETHING',
       'unique_identifier': 'SOMETHING',
       'original_transaction_id': 'SOMETHING',
       'purchase_date_ms': 'SOMETHING',
       'web_order_line_item_id': 'SOMETHING',
       'is_trial_period': 'SOMETHING',
       'is_in_intro_offer_period': 'SOMETHING',
       'product_id': 'SOMETHING',
       'original_purchase_date_ms': 'SOMETHING',
       'original_purchase_date_pst': 'SOMETHING',
       'expires_date_formatted': 'SOMETHING',
       'item_id': 'SOMETHING',
       'purchase_date': 'SOMETHING',
       'bvrs': 'SOMETHING',
       'quantity': 'SOMETHING'
       },
'notification_type': 'SOMETHING',
}

But unfortunately there is no password field. Does anybody know why and how to fix it?
According to: https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/StoreKitGuide/Chapters/Subscriptions.html
there should be password field.

Please help!