Updating an existing contact with new form data via API
SOLVE
My website has several forms (using NinjaForms with a Hubspot Add On), each designed to add a unique piece of data to the database for a lead. It seems however that Hubspot won't update an existing record. This error resulted after filling out a form:
Result : Rejected by API. Contact already exists.
What needs to happen for Hubspot to update an existing contact with new data?