Enum describing possible types of call to action.

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

| Enums ||
|---|---|
| ## `APPLY_NOW` | The call to action type is apply now. |
| ## `BOOK_NOW` | The call to action type is book now. |
| ## `BUY_NOW` | The call to action type is buy now. |
| ## `CONTACT_US` | The call to action type is contact us. |
| ## `DONATE_NOW` | The call to action type is donate now. |
| ## `DOWNLOAD` | The call to action type is download. |
| ## `GET_QUOTE` | The call to action type is get quote. |
| ## `LEARN_MORE` | The call to action type is learn more. |
| ## `ORDER_NOW` | The call to action type is order now. |
| ## `PLAY_NOW` | The call to action type is play now. |
| ## `SEE_MORE` | The call to action type is see more. |
| ## `SHOP_NOW` | The call to action type is shop now. |
| ## `SIGN_UP` | The call to action type is sign up. |
| ## `START_NOW` | The call to action type is start now. |
| ## `SUBSCRIBE` | The call to action type is subscribe. |
| ## `UNKNOWN` | Used for return value only. Represents value unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |
| ## `VISIT_SITE` | The call to action type is visit site. |
| ## `WATCH_NOW` | The call to action type is watch now. |