Enumerates conversion customer types.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/conversion_customer_type.proto)

| Enums ||
|---|---|
| ## `NEW` | Converting user is new to the advertiser. |
| ## `RETURNING` | Converting user is returning to the advertiser. Definition of returning differs among conversion types, such as a second store visit versus a second online purchase. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |