Hi @Farukh Shaik can you please share the error you are receiving?

error is entity not defined

I'm guessing you got that snippet from https://www.manula.com/manuals/siemplify/developers-hub/version.one/en/topic/my-first-action

If you note, "entity" in this case is being used as the iterator in the for loop
for entity in siemplify.target_entities:
siemplify.LOGGER.info(f"proccessing entity {entity.identifier}")
if (entity.entity_type == EntityTypes.HOSTNAME and not entity.is_internal) or entity.entity_type == EntityTypes.URL:
entity_to_scan = entity.identifier

scan_url = f"{url}&domainName={entity_to_scan}"

response = requests.get(scan_url)
response.raise_for_status()
register_details = response.json().get("WhoisRecord", {}).get("registrant", {})
if register_details:
entity.additional_properties.update(register_details)
successfull_entities.append(entity)
Which, entity is iterating over siemplify.target_entities

So, I believe the answer to your question is you must have the following:

from SiemplifyAction import SiemplifyAction

siemplify = SiemplifyAction()

for entity in siemplify.target_entities:
flat_user_data = {"key1":"value1"}
entity.additional_properties.update(flat_user_data)

well, the line entity.additional_properties.update(flat_user_data) should be tabbed over to stay in the for loop.