The audit metadata. Captures all invoicing actions on create, send, update, and cancel.
create_timestring<date_time>OptionalNote: The regular expression provides guidance but does not reject all invalid dates.
last_update_timestring<date_time>OptionalNote: The regular expression provides guidance but does not reject all invalid dates.
cancel_timestring<date_time>OptionalNote: The regular expression provides guidance but does not reject all invalid dates.
first_sent_timestring<date_time>OptionalNote: The regular expression provides guidance but does not reject all invalid dates.
last_sent_timestring<date_time>OptionalNote: The regular expression provides guidance but does not reject all invalid dates.
created_by_flowenum<invoice_creation_flow>Optional