[PW-5867] HMAC verification functions corrupt notification item payload

Python version: 3.9.6
Library version: 5.1.0
Description
Adyen.util.is_valid_hmac_notification and Adyen.util.is_valid_hmac delete the entire "additionalData" key and dictionary from a notification, discarding any merchant provided metadata and other information in there.

Steps to reproduce:

1. Consume a webhook notification with HMAC
2. Run the item through above helper functions
3. See the "additionalData" is removed from the notification item, including all other data in there

Please see:

• adyen-python-api-library/Adyen/util.py

  Line 43 in a6f4bc6

  del dict_object['additionalData']

• adyen-python-api-library/Adyen/util.py

  Line 93 in a6f4bc6

  del dict_object['additionalData']

As a workaround, we have to deepcopy the entire notitication before validating it.

[AlexandrosMor]

Hello @dkms-its,

We are going to open an internal ticket for it and pick it up as soon as possible. In the mean time feel free to open a Pull Request and we are going to review it.

kind regards,
Alexandros
Adyen

[jillingk]

Closing this ticket as the PR to fix this issue has been approved.