Applicable for versions above 11.0
1. Download all the contents in the attachment and paste it under \ManageEngine\Supportcentre\integrations\Custom Scripts.
2. Create an additional field and copy the API Field Name and edit the same in the Script given as in the screen shot.
3) Take the Technician Key from the home page -> Login -> Generate API Key, select on Never Expires, and select the key from the Popup.
Add the API key in the configuration.json from the attachments given.
4) Open the customer Trigger from the Admin Tab and Create a Trigger as per the below screen shot.
Syntax: py update_additionalfield .py $COMPLETE_V3_JSON_FILE