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# Deprecated properties

> Reference for adapter properties that are no longer recommended and have been replaced by the .system entity.

The properties listed on this page should not be used in new or updated adapters. They remain supported in the codebase, but they are not best practice. Some older adapters may still use them.

These properties were replaced by the `.system` entity, which provides expanded capabilities for token requests and healthchecks. If your adapter uses these properties, migrate to the `.system` entity.

## Authentication

| Property               | Type   | Description                                                                        |
| ---------------------- | ------ | ---------------------------------------------------------------------------------- |
| `token_user_field`     | string | The field name that should contain the login username when requesting a token.     |
| `token_password_field` | string | The field name that should contain the password when requesting a token.           |
| `token_result_field`   | string | The field name in the token response that contains the returned token.             |
| `token_URI_path`       | string | The URI path used to retrieve an authentication token for a dynamic token request. |

## Healthcheck

| Property   | Type   | Description                                                                      |
| ---------- | ------ | -------------------------------------------------------------------------------- |
| `protocol` | string | The protocol (for example, `REST`) used to communicate with the external system. |
| `URI_Path` | string | The path used to check whether the external system is up and operational.        |

> Reference for adapter properties that are no longer recommended and have been replaced by the .system entity.