Possible enumeration values:

NameValueDescription
contact_change

1

email_campaign

2

sms_campaign

3

login

4

survey

5

contact_manual_change

6

automation_step

7

contact_added_to_group

8

contact_removed_from_group

9

contact_unsubscribed

10

contact_updated

11

contact_added_via_landing_page

12

contact_added_via_signup_form

13