Participant Update -Title
To modify the title associated with an existing account, employ the /api/v2/account/set
endpoint. To update a specific visitor, identify them using one of EP's accepted matching methods and employ the subsequent fields
event_id:
The unique identifier for the event. (integer)id:
Account ID (integer)title:
User“s title (string)

Notice: Acceptable values for the "title" parameter are limited to "Mr." and "Mrs." However, this field can be removed and a custom field created to allow for a wider range of title options.