Your API key (required)

The contact's email address (required)

The contact's first name

The contact's last name

One or more tag UUIDs separated by comma to add to the contact

One or more sequence UUIDs separated by comma to immediately trigger for the contact

The form UUID to associate with the contact (if required)

The goal UUID to mark as complete (if applicable)

Send through one or more field keys (such as 27__website) to set custom attributes. IMPORTANT.. if the parameter form_id is also being provided, the respective form must have been configured with the following option activated: [include all enabled custom fields].