# UpdateInstanceAuthConfigRequestBody


## Fields

| Field                                                                                                                                                                                                                                                                    | Type                                                                                                                                                                                                                                                                     | Required                                                                                                                                                                                                                                                                 | Description                                                                                                                                                                                                                                                              |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `restrictedToAllowlist`                                                                                                                                                                                                                                                  | *JsonNullable<? extends Boolean>*                                                                                                                                                                                                                                        | :heavy_minus_sign:                                                                                                                                                                                                                                                       | Whether sign up is restricted to email addresses, phone numbers and usernames that are on the allowlist.                                                                                                                                                                 |
| `fromEmailAddress`                                                                                                                                                                                                                                                       | *JsonNullable<? extends String>*                                                                                                                                                                                                                                         | :heavy_minus_sign:                                                                                                                                                                                                                                                       | The local part of the email address from which authentication-related emails (e.g. OTP code, magic links) will be sent.<br/>Only alphanumeric values are allowed.<br/>Note that this value should contain only the local part of the address (e.g. `foo` for `foo@example.com`). |
| `progressiveSignUp`                                                                                                                                                                                                                                                      | *JsonNullable<? extends Boolean>*                                                                                                                                                                                                                                        | :heavy_minus_sign:                                                                                                                                                                                                                                                       | Enable the Progressive Sign Up algorithm. Refer to the [docs](https://clerk.com/docs/upgrade-guides/progressive-sign-up) for more info.                                                                                                                                  |
| `sessionTokenTemplate`                                                                                                                                                                                                                                                   | *JsonNullable<? extends String>*                                                                                                                                                                                                                                         | :heavy_minus_sign:                                                                                                                                                                                                                                                       | The name of the JWT Template used to augment your session tokens. To disable this, pass an empty string.                                                                                                                                                                 |
| `enhancedEmailDeliverability`                                                                                                                                                                                                                                            | *JsonNullable<? extends Boolean>*                                                                                                                                                                                                                                        | :heavy_minus_sign:                                                                                                                                                                                                                                                       | The "enhanced_email_deliverability" feature will send emails from "verifications@clerk.dev" instead of your domain.<br/>This can be helpful if you do not have a high domain reputation.                                                                                 |
| `testMode`                                                                                                                                                                                                                                                               | *JsonNullable<? extends Boolean>*                                                                                                                                                                                                                                        | :heavy_minus_sign:                                                                                                                                                                                                                                                       | Toggles test mode for this instance, allowing the use of test email addresses and phone numbers.<br/>Defaults to true for development instances.                                                                                                                         |