Open the link below to see the list of available fields for the Automation Activities array, their data type and required or optional properties.

docs.google.com

AutomationActivities

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Automation schedule

schedule_time_zone

The schedule_time_zone field in Automation_Schedule accepts two reserved strings in addition to standard timezone identifiers. These activate special delivery behavior's and are stored internally differently from what you submit.

1. same_time_sending — same as "Recipient Local Time" in the UI. When selected, the automation begins at the set time on the earliest time zone possible (UTC+14:00) so that the email is sent as closely as possible to each contact's local time. The contact's local timezone is read from their timezone column; use a numeric ±HH:MM format (e.g. -08:00) since textual formats are subject to change. If the scheduled time has already passed in a contact's timezone, the email is sent as soon as possible. If the timezone column is NULL, the client default timezone is used.
2. send_time_optimisation — same as "Send Time Optimization" in the UI. When selected, the automation begins at the set time on the earliest timezone possible (UTC+14:00) so that the email is sent when each contact is most active. Delivery may be deferred to the following day if a contact's calculated optimal send time has already passed when the send activity runs.