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auto_cancellation
The auto cancellation details for the invoice. If the payer does not pay by the specified date, the invoice is automatically cancelled.
The stand-alone date, in [Internet date and time format](https://tools.ietf.org/html/rfc3339#section-5.6). To represent special legal values, such as a date of birth, you should use dates with no associated time or time-zone data. Whenever possible, use the standard `date_time` type. This regular expression does not validate all dates. For example, February 31 is valid and nothing is known about leap years.