Representing the status of an invoice.
* `Pending` (value: `'PENDING'`)
* `Paid` (value: `'PAID'`)
* `Settled` (value: `'SETTLED'`)
* `Expired` (value: `'EXPIRED'`)
* `XenditEnumDefaultFallback` (value: `UNKNOWN_ENUM_VALUE`)
If you encounter UNKNOWN_ENUM_VALUE
, it means that this ENUM is unavailable in your current SDK version. Please upgrade to get the newest ENUM.