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| API Code | API Message | HTTP Status | Description |
| 1 | API Key not valid | 403 | The specified API doesn't have access to any Sentori Accounts. |
| 2 | Failed to set account | 403 | The API Key appears valid but the Sentori Account cannot be accessed. |
| 100 | Email Address not valid | 400 | The Email Address in the request isn't a valid email address. |
| 101 | Contact not found | 404 | The Contact specified in the request couldn't be found in the Sentori Account |
| 102 | Email Address already in use | 400 | The Email Address in the request is already in use by another Contact. |
| 103 | Contact Fields not valid | 400 | The Contact Fields (or there values) in the request are not valid for this Sentori Account. |
| 200 | Mailing List not found | 404 | The Mailing List specified in the request couldn't be found in the Sentori Account |
| 4031 | Forbidden | 403 | The specified API doesn't have access to any Sentori Accounts. |
| 4032 | Could not locate Account | 403 | The API Key appears valid but the Sentori Account doesn't appear to exist. |