Types of incentives offered

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

| Enums ||
|---|---|
| ## `ACQUISITION` | An acquisition incentive. |
| ## `UNKNOWN` | Unknown incentive type. Should not be used as a value explicitly. |
| ## `UNSPECIFIED` | Not specified. |