The name of the source the activity came from. A free string, not an enum: integrations, apps and businesses write their own values (e.g., "initiated_by_staff", "website", "client_portal", "automatic_messages", "campaign", "automation", "api", "call", "rwg_redirect", "AI Receptionist", "square", "unknown").

The channel inside the source, for example the widget or the medium. A free string, not an enum: integrations and businesses write their own values (e.g., "scheduler_widget", "contact_form", "client_portal_widget", "email", "sms", "csv_import", "manual_contact", "square", "Paid Search"). Most sources have no channel.

The campaign of the source, in the UTM sense: the label of what sent the link to the client. Its meaning depends on source_name: a message template, a campaign uid, or the business phone number (e.g., "message_request", "client_reminder", "scheduled_payments", "+15551234567"). Null for most sources.

The page where the activity started: the business website page with a widget, the client portal page, the online scheduling page, or the link of a message. Longer values are cut to 255 characters.