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The frequency of the recurring invoice series cycle.
objectinterval_unitrequiredstring"DAY", "WEEK", "MONTH", "YEAR"The time unit for the recurring invoice cycle interval. Used together with interval_count to determine the frequency of invoice generation.
interval_countrequiredinteger1The number of intervals between each recurring invoice cycle. For example, an interval_count of 2 with interval_unit of MONTH means the invoice recurs every 2 months.