Globally unique UUID that identifies a specific Organization. The `organization_id` is critical to perform operations on an Organization, so be sure to preserve this value. You may also use the organization_slug or organization_external_id here as a convenience.

Globally unique UUID that identifies a specific Member. The `member_id` is critical to perform operations on a Member, so be sure to preserve this value. You may use an external_id here if one is set for the member.

The code to authenticate.

The Intermediate Session Token. This token does not necessarily belong to a specific instance of a Member, but represents a bag of factors that may be converted to a member session. The token can be used with the [OTP SMS Authenticate endpoint](https://stytch.com/docs/b2b/api/authenticate-otp-sms), [TOTP Authenticate endpoint](https://stytch.com/docs/b2b/api/authenticate-totp), or [Recovery Codes Recover endpoint](https://stytch.com/docs/b2b/api/recovery-codes-recover) to complete an MFA flow and log in to the Organization. The token has a default expiry of 10 minutes. It can also be used with the [Exchange Intermediate Session endpoint](https://stytch.com/docs/b2b/api/exchange-intermediate-session) to join a specific Organization that allows the factors represented by the intermediate session token; or the [Create Organization via Discovery endpoint](https://stytch.com/docs/b2b/api/create-organization-via-discovery) to create a new Organization and Member. Intermediate Session Tokens have a default expiry of 10 minutes.

A secret token for a given Stytch Session.

The JSON Web Token (JWT) for a given Stytch Session.

Set the session lifetime to be this many minutes from now. This will start a new session if one doesn't already exist, returning both an opaque `session_token` and `session_jwt` for this session. Remember that the `session_jwt` will have a fixed lifetime of five minutes regardless of the underlying session duration, and will need to be refreshed over time. This value must be a minimum of 5 and a maximum of 527040 minutes (366 days). If a `session_token` or `session_jwt` is provided then a successful authentication will continue to extend the session this many minutes. If the `session_duration_minutes` parameter is not specified, a Stytch session will be created with a 60 minute duration. If you don't want to use the Stytch session product, you can ignore the session fields in the response.

Add a custom claims map to the Session being authenticated. Claims are only created if a Session is initialized by providing a value in `session_duration_minutes`. Claims will be included on the Session object and in the JWT. To update a key in an existing Session, supply a new value. To delete a key, supply a null value. Custom claims made with reserved claims (`iss`, `sub`, `aud`, `exp`, `nbf`, `iat`, `jti`) will be ignored. Total custom claims size cannot exceed four kilobytes.

Optionally sets the Member’s MFA enrollment status upon a successful authentication. If the Organization’s MFA policy is `REQUIRED_FOR_ALL`, this field will be ignored. If this field is not passed in, the Member’s `mfa_enrolled` boolean will not be affected. The options are: `enroll` – sets the Member's `mfa_enrolled` boolean to `true`. The Member will be required to complete an MFA step upon subsequent logins to the Organization. `unenroll` – sets the Member's `mfa_enrolled` boolean to `false`. The Member will no longer be required to complete MFA steps when logging in to the Organization.

If passed will set the authenticated method to the default MFA method. Completing an MFA authentication flow for the first time for a Member will implicitly set the method to the default MFA method. This option can be used to update the default MFA method if multiple are being used.

If the `telemetry_id` is passed, as part of this request, Stytch will call the [Fingerprint Lookup API](https://stytch.com/docs/fraud/api/fingerprint-lookup) and store the associated fingerprints and IPGEO information for the Member. Your workspace must be enabled for Device Fingerprinting to use this feature.