The possible type of invoices.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/enums/invoice_type.proto)

| Enums ||
|---|---|
| ## `CREDIT_MEMO` | An invoice with a negative amount. The account receives a credit. |
| ## `INVOICE` | An invoice with a positive amount. The account owes a balance. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |