Auth

Signup, login, MFA, sessions, password and email lifecycle, and how an Application gets the per-app JWT it trusts. See Trust Model for what an Application does with that token once it has one.

  1. Native auth and per-Organization SSO
  2. Token types at a glance
  3. Endpoints
  4. The AuthSession response
  5. POST /v1/auth/signup
  6. POST /v1/auth/login
  7. POST /v1/auth/mfa/verify
  8. POST /v1/auth/token/refresh
  9. POST /v1/auth/logout
  10. Getting an app token
    1. The app token
    2. POST /v1/auth/app-tokens
    3. POST /v1/auth/oauth/authorization-codes
    4. POST /v1/auth/oauth/token
  11. Email verification
    1. POST /v1/auth/email/verify
    2. POST /v1/auth/email/verify/resend
  12. Password lifecycle
    1. POST /v1/auth/password/forgot
    2. POST /v1/auth/password/reset
    3. POST /v1/users/{id}/password
  13. Invitations
    1. POST /v1/auth/invitations/accept
  14. MFA (TOTP)
    1. POST /v1/users/{id}/mfa/totp — begin enrollment
    2. POST /v1/users/{id}/mfa/totp/confirm
    3. POST /v1/users/{id}/mfa/totp/disable
    4. DELETE /v1/users/{id}/mfa/totp — support reset
  15. Sessions
    1. GET /v1/users/{id}/sessions
    2. DELETE /v1/users/{id}/sessions/{sessionId}
  16. POST /v1/auth/sso/{provider}/callback
  17. Signing keys (JWKS)
  18. Errors specific to this resource

Native auth and per-Organization SSO

Both, not either/or: native in-house auth, architected from the start for pluggable, per-Organization SSO.

  • Native email/password is owned here, not delegated. It’s a real password_hash and real sessions, live from Phase 1, with zero external integration needed: no Auth0/WorkOS/Cognito account, no third-party API key, nothing to configure. A single developer standing up their first Application has a fully working login system the moment Phase 1 ships.
  • SSO is a per-Organization bridge, not a platform-wide or per-Application choice. An Organization admin connects their own company’s identity provider (Okta, Azure AD, Google Workspace, …) through a federation broker (leaning WorkOS, for exactly this “bring your own enterprise IdP” case), and it becomes available to every member of that Organization. See Domain Model → SSOConnection.
  • A User can hold both at once, a password identity and an sso identity, and choose either at login. See Domain Model → UserIdentity.
  • MFA (TOTP) is optional and user-enabled for native accounts, through self-service enrollment. It isn’t built for SSO identities, whose MFA policy belongs to the member’s own IdP.
  • Sequencing: the UserIdentity/SSOConnection schema and the auth endpoints are built in this shape now, so adding a real SSO broker later is additive, not a breaking migration. The broker integration itself is explicitly not being built yet. POST /v1/auth/sso/{provider}/callback exists as a route and returns 501 not_implemented until it is.

How an Application obtains its per-app JWT is covered under Getting an app token: embedded login now, hosted authorization code + PKCE once Substratal’s hosted sign-in page exists. That hosted page is required before any third-party Application goes live.

Token types at a glance

Token Format TTL Issued by Used for
Platform access token JWT (RS256) 15 minutes login, mfa/verify, token/refresh, signup, invitations/accept Calling this API as a User (Authorization: Bearer …).
Refresh token Opaque, rtk_… 30 days idle, 90 days absolute Same as above Getting a new platform access token. Single-use, rotating.
App token JWT (RS256), aud = one application_id 5 minutes app-tokens, oauth/token Presented by a User to one Application, verified locally by that Application. See Trust Model.
App refresh token Opaque, rtk_…, bound to one Application 30 days idle, 90 days absolute oauth/token Getting a new app token without a platform session (hosted flow only). Re-checks access every time.
API Key secret Opaque, satk_live_… / satk_test_… Until revoked API Keys Service-to-service calls. Not a User session.

Every platform access token and app token is signed with a key published at https://api.substratalapps.com/.well-known/jwks.json (see Signing keys). Every login creates a session (ses_…); refresh tokens and app refresh tokens belong to exactly one session, and revoking the session revokes all of them at once.

Endpoints

Method Path Auth Purpose
POST /v1/auth/signup none Self-service account creation with email + password.
POST /v1/auth/login none Exchange email + password for a session (or an MFA challenge).
POST /v1/auth/mfa/verify none (mfa_token) Complete a login that returned an MFA challenge.
POST /v1/auth/token/refresh none (refresh_token) Rotate a platform refresh token for a new access token.
POST /v1/auth/logout Bearer (user) Revoke the current session, or every session.
POST /v1/auth/app-tokens Bearer (user) Mint a per-app JWT from a platform session (embedded login).
POST /v1/auth/oauth/authorization-codes Bearer (user) Mint a one-time authorization code for a hosted launch (PKCE).
POST /v1/auth/oauth/token none (code / refresh token) Exchange an authorization code or app refresh token for an app token.
POST /v1/auth/email/verify none (token) Confirm an email address from the link in a verification email.
POST /v1/auth/email/verify/resend none Re-send a verification email. Always 202.
POST /v1/auth/password/forgot none Send a password-reset email. Always 202.
POST /v1/auth/password/reset none (token) Set a new password from a reset token.
POST /v1/auth/invitations/accept none (token) Set a password on an invited account and activate it.
POST /v1/auth/sso/{provider}/callback none Complete an SSO login. 501 until the broker integration ships.
POST /v1/users/{id}/password Bearer (self) Change password, given the current one.
POST /v1/users/{id}/mfa/totp Bearer (self) Begin TOTP enrollment.
POST /v1/users/{id}/mfa/totp/confirm Bearer (self) Confirm enrollment with a first code; returns recovery codes.
POST /v1/users/{id}/mfa/totp/disable Bearer (self) Turn TOTP off, given a current code or recovery code.
DELETE /v1/users/{id}/mfa/totp Bearer (users.manage) Support reset for a user who lost their device.
GET /v1/users/{id}/sessions Bearer (self or users.manage) List active sessions.
DELETE /v1/users/{id}/sessions/{sessionId} Bearer (self or users.manage) Revoke one session.
GET /.well-known/jwks.json none Public signing keys. Outside /v1.
GET /.well-known/openid-configuration none Issuer metadata (issuer, JWKS URI, token endpoint). Outside /v1.

All unauthenticated POST /v1/auth/* endpoints are rate-limited per IP address as well as per account — see Non-Functional Requirements → Rate limiting.

The AuthSession response

Every endpoint that establishes or refreshes a platform session returns this shape:

{
  "token_type": "Bearer",
  "access_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6InNrXzIwMjYxMCJ9...",
  "expires_in": 900,
  "refresh_token": "rtk_01JAG8K4Q9R0S1T2U3V4W5X6Y7",
  "refresh_token_expires_in": 2592000,
  "session_id": "ses_01JAG8K4Q9R0S1T2U3V4W5X6Y8",
  "user_id": "usr_01JAG3Z9X8QS3F6K2M4N5P6R7S",
  "email_verified": true
}

The platform access token’s claims:

{
  "iss": "https://api.substratalapps.com",
  "aud": "substratal-platform",
  "sub": "usr_01JAG3Z9X8QS3F6K2M4N5P6R7S",
  "sid": "ses_01JAG8K4Q9R0S1T2U3V4W5X6Y8",
  "amr": ["pwd", "otp"],
  "email_verified": true,
  "test_mode": false,
  "iat": 1730649600,
  "exp": 1730650500,
  "jti": "atk_01JAG8K5A1B2C3D4E5F6G7H8J9"
}

amr lists the authentication methods used (pwd, otp, recovery_code, sso). The platform access token carries no permissions — the API resolves the caller’s Roles fresh on every request, so a Role change takes effect on the very next call, not at the next refresh.

POST /v1/auth/signup 

// Request
{
  "email": "jordan@example.com",
  "password": "correct horse battery staple",
  "display_name": "Jordan Alvarez",
  "application_id": "app_timetrack"
}

// Response — 201, an AuthSession
{
  "token_type": "Bearer",
  "access_token": "eyJhbGciOiJSUzI1NiIs...",
  "expires_in": 900,
  "refresh_token": "rtk_01JAG8K4Q9R0S1T2U3V4W5X6Y7",
  "refresh_token_expires_in": 2592000,
  "session_id": "ses_01JAG8K4Q9R0S1T2U3V4W5X6Y8",
  "user_id": "usr_01JAG3Z9X8QS3F6K2M4N5P6R7S",
  "email_verified": false
}
  • Creates the User (status: active, email_verified: false), a password UserIdentity, a default Profile (with display_name if given) and Settings, and the member platform Role — one transaction, same as POST /v1/users.
  • Sends a verification email (token TTL 24 hours). An unverified User can log in; email_verified is carried in every token so an Application can decide for itself whether to gate anything on it.
  • application_id is optional and grants nothing — it records which Application the signup came from (signup_application_id on the User, used to brand the verification email with that app’s email_from_name) and is otherwise informational. Access to an Application still requires an Entitlement, which the developer’s own backend grants (see Workflows → Purchase → access).
  • If the email belongs to an invited User, signup completes the invitation instead: the password is set, status becomes active, and the invitation token is consumed.
  • Password policy: 12–128 characters; rejected if it appears in the bundled breached-password list (top 100,000) or equals the email address. No composition rules. Stored as Argon2id (m=19456 KiB, t=2, p=1).
Error Status When
email_taken 409 An active or suspended User already has this email.
weak_password 422 Fails the password policy; details.reason is too_short, too_long, breached, or matches_email.
validation_failed 422 Malformed email, unknown application_id, etc.

POST /v1/auth/login 

// Request
{ "email": "jordan@example.com", "password": "correct horse battery staple" }

// Response — 200, no MFA enrolled: an AuthSession (see above)

// Response — 200, MFA enrolled: a challenge instead of a session
{
  "mfa_required": true,
  "mfa_token": "mfa_01JAG8M2N3P4Q5R6S7T8U9V0W1",
  "methods": ["totp", "recovery_code"],
  "expires_in": 300
}

Clients must branch on mfa_required before reading access_token.

Error Status When
invalid_credentials 401 Unknown email, wrong password, or an invited User with no password yet. Deliberately one code for all three — no account enumeration.
account_suspended 403 Correct credentials, but status: suspended.
too_many_attempts 429 5 failed attempts for this account in 15 minutes locks it for 15 minutes; Retry-After is set. Successful login resets the counter.

Updates last_login_at on the User and last_used_at on the matching UserIdentity.

POST /v1/auth/mfa/verify 

// Request — a TOTP code
{ "mfa_token": "mfa_01JAG8M2N3P4Q5R6S7T8U9V0W1", "code": "492039" }

// Request — or a recovery code instead
{ "mfa_token": "mfa_01JAG8M2N3P4Q5R6S7T8U9V0W1", "recovery_code": "7hq2-kx9m-a4vd" }

// Response — 200, an AuthSession

TOTP is RFC 6238, SHA-1, 6 digits, 30-second step, accepting ±1 step of clock drift; a code can’t be reused within its window. A recovery code is single-use. The mfa_token is single-use and valid 5 minutes; 5 wrong codes invalidate it.

Error Status When
invalid_mfa_code 401 Wrong or reused code.
mfa_token_invalid 401 Expired, already used, or exhausted. Start over at login.

POST /v1/auth/token/refresh 

// Request
{ "refresh_token": "rtk_01JAG8K4Q9R0S1T2U3V4W5X6Y7" }

// Response — 200, an AuthSession with a new access_token AND a new refresh_token

Refresh tokens are single-use. Presenting one that has already been rotated is treated as theft: the whole session is revoked, and every token in it stops working (401 refresh_token_reused). Refresh fails with 401 session_revoked after logout, password reset, suspension, or deletion.

POST /v1/auth/logout 

// Request — this session only (default)
{}

// Request — every session this User has, on every device
{ "all_sessions": true }

// Response — 204

Revokes the session(s): the refresh token and any app refresh tokens in them stop working immediately, and the platform access token is rejected from then on — the API checks sid against the session table on every request, so logout is immediate, not “at access-token expiry”. Already-issued app tokens are not recalled (they’re verified locally by Applications, by design); they expire within 5 minutes. Logout does not by itself fire access.revoked — the User still has access; they’ve just signed out.

Getting an app token

Embedded login is allowed today because every Application is first-party, so no third party ever handles a Substratal password. It’s blocked for any Application not owned by Substratal once self-service registration ships, and the hosted sign-in page must exist before any third-party Application goes live. Requiring the hosted page from Phase 1 instead was considered and not chosen: it would make the MVP depend on a UI project.

An app token is the per-Application JWT that Trust Model describes. Two ways to get one:

Path When Calls
Embedded The Application draws its own sign-in screen (any first-party app, native or web — the only option until the hosted page exists). login → app-tokens. Refresh the platform session with token/refresh, then call app-tokens again.
Hosted + PKCE The Application sends the user to Substratal’s hosted sign-in page (ships with the dashboard), and never sees the password. Required for third-party Applications. Hosted page calls oauth/authorization-codes → app calls oauth/token. Refresh with oauth/token (grant_type: refresh_token).

Both paths produce the identical app token. Either way, issuance fails if the User doesn’t have active access to the Application right now:

Error Status When
entitlement_required 403 Resolved entitlement status isn’t active (see Access Control). details.entitlement_status says what it is.
application_not_available 403 The Application’s review_status is suspended/rejected/pending_review — see Applications → review lifecycle.
account_suspended 403 The User is suspended.

The app token 

{
  "iss": "https://api.substratalapps.com",
  "aud": "app_timetrack",
  "sub": "usr_01JAG3Z9X8QS3F6K2M4N5P6R7S",
  "sid": "ses_01JAG8K4Q9R0S1T2U3V4W5X6Y8",
  "org_id": null,
  "email": "jordan@example.com",
  "email_verified": true,
  "entitlement_status": "active",
  "effective_permissions": ["app.timetrack.export", "app.timetrack.manage_members"],
  "test_mode": false,
  "iat": 1730649600,
  "exp": 1730649900,
  "jti": "apt_01JAG8P1Q2R3S4T5U6V7W8X9Y0"
}
  • effective_permissions contains only this Application’s own app.<slug>.* keys — never platform permissions. See Access Control → Step 2.
  • org_id is the Organization whose org-wide grant provided access, if access came only through an Organization; null if the User has a personal Entitlement (personal wins for attribution when both exist). If multiple Organizations provide access and there’s no personal path, it’s the one whose grant was created first. Pass organization_id to app-tokens to pick a specific one explicitly.
  • sid lets an Application key its own local session to the hub session, so that an access.revoked webhook or a logout-everywhere can be matched to the right local session.

POST /v1/auth/app-tokens 

// Request
{ "application_id": "app_timetrack" }

// Response — 200
{
  "token_type": "Bearer",
  "app_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6InNrXzIwMjYxMCJ9...",
  "expires_in": 300,
  "application_id": "app_timetrack"
}

Bearer must be a platform access token (a User), not an API Key — 400 user_token_required otherwise. Optional organization_id selects which Organization’s grant to attribute org_id to; 403 entitlement_required if that Organization doesn’t actually include this User.

POST /v1/auth/oauth/authorization-codes

Called by Substratal’s hosted sign-in page (or the future dashboard’s “Launch” button) on the signed-in User’s behalf — not by the Application.

// Request
{
  "application_id": "app_timetrack",
  "redirect_uri": "com.substratal.timetrack:/oauth/callback",
  "code_challenge": "E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM",
  "code_challenge_method": "S256",
  "state": "af0ifjsldkj"
}

// Response — 201
{
  "code": "ac_01JAG8R4S5T6U7V8W9X0Y1Z2A3",
  "expires_in": 60,
  "redirect_to": "com.substratal.timetrack:/oauth/callback?code=ac_01JAG8R4S5T6U7V8W9X0Y1Z2A3&state=af0ifjsldkj"
}

redirect_uri must exactly match one of the Application’s registered redirect_uris (422 redirect_uri_not_registered); code_challenge_method must be S256 (plain is rejected). The code is single-use and expires in 60 seconds. Access is checked here too, with the same errors as above, so a User without access is never redirected into the app holding a code.

POST /v1/auth/oauth/token

Called by the Application. A public-client endpoint: there’s no client secret, the PKCE verifier is the proof.

// Request — exchange an authorization code
{
  "grant_type": "authorization_code",
  "client_id": "app_timetrack",
  "code": "ac_01JAG8R4S5T6U7V8W9X0Y1Z2A3",
  "code_verifier": "dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk",
  "redirect_uri": "com.substratal.timetrack:/oauth/callback"
}

// Request — refresh
{
  "grant_type": "refresh_token",
  "client_id": "app_timetrack",
  "refresh_token": "rtk_01JAG8S5T6U7V8W9X0Y1Z2A3B4"
}

// Response — 200
{
  "token_type": "Bearer",
  "app_token": "eyJhbGciOiJSUzI1NiIs...",
  "expires_in": 300,
  "refresh_token": "rtk_01JAG8T6U7V8W9X0Y1Z2A3B4C5",
  "refresh_token_expires_in": 2592000,
  "application_id": "app_timetrack"
}

Accepts application/json and, for compatibility with standard OAuth client libraries (AppAuth, etc.), application/x-www-form-urlencoded. Errors on this one endpoint use the OAuth 2.0 shape ({"error": "invalid_grant", "error_description": "..."}) instead of this API’s usual envelope, again for library compatibility: invalid_grant (bad/expired/reused code or verifier mismatch), invalid_client (unknown client_id), unsupported_grant_type, and access_denied (access no longer active — error_description carries the entitlement_required detail). A refresh re-checks access every time — a refresh after revocation fails, which is what makes the hosted flow safe without a platform session.

Email verification

Transactional email (verification, password reset, invitations, MFA changes) is sent through Amazon SES in the same AWS account, so it adds no new sub-processor. Templates are Substratal-branded; an Application can set email_from_name and support_url so a message triggered from inside it names the app. A full per-Application custom domain and template is deferred.

POST /v1/auth/email/verify 

// Request — token from the emailed link
{ "token": "emv_01JAG8V8W9X0Y1Z2A3B4C5D6E7" }

// Response — 204

Sets email_verified: true (or, for a pending email change, swaps pending_email into email — see Users → PATCH). Token: single-use, 24-hour TTL. 400 token_invalid if expired, used, or unknown.

POST /v1/auth/email/verify/resend 

// Request
{ "email": "jordan@example.com" }

// Response — 202, always, whether or not the email exists or is already verified

Limited to 3 per email per hour.

Password lifecycle

POST /v1/auth/password/forgot 

// Request
{ "email": "jordan@example.com" }

// Response — 202, always — never reveals whether the account exists

Sends a reset link (token pwr_…, single-use, 1-hour TTL) to an active User with a password identity. An SSO-only User gets an email explaining they sign in through their organization instead. Limited to 3 per email per hour.

POST /v1/auth/password/reset 

// Request
{ "token": "pwr_01JAG8W9X0Y1Z2A3B4C5D6E7F8", "new_password": "a new long passphrase" }

// Response — 204

Sets the new password (same policy as signup), marks the email verified (the User just proved control of it), revokes every session, and emails a “your password was changed” notice. Writes Audit Event user.password_reset. Errors: 400 token_invalid, 422 weak_password.

POST /v1/users/{id}/password 

// Request
{ "current_password": "correct horse battery staple", "new_password": "a new long passphrase" }

// Response — 204

Self only (an admin cannot set a User’s password — they can only trigger password/forgot on the User’s behalf). Revokes every other session; the calling session survives. Errors: 401 invalid_credentials (wrong current password), 422 weak_password. Writes user.password_changed.

Invitations

POST /v1/users with status: "invited" (the default — see Users) or POST /v1/organizations/{id}/members with an unknown email creates an invited User and emails an invitation link (token inv_…, single-use, 7-day TTL).

POST /v1/auth/invitations/accept 

// Request
{ "token": "inv_01JAG8X0Y1Z2A3B4C5D6E7F8G9", "password": "correct horse battery staple", "display_name": "Jordan Alvarez" }

// Response — 200, an AuthSession

Creates the password identity, sets status: active and email_verified: true, and signs the User in. Errors: 400 token_invalid (expired invitations are re-sent with POST /v1/users/{id}/invitation — see Users), 422 weak_password.

MFA (TOTP)

Optional and self-service for password identities. Meaningless for a method: sso identity, whose MFA policy belongs to the Organization’s own IdP (409 mfa_not_applicable if the User has no password identity).

POST /v1/users/{id}/mfa/totp — begin enrollment 

// Request
{}

// Response — 200
{
  "secret": "JBSWY3DPEHPK3PXP",
  "otpauth_uri": "otpauth://totp/Substratal:jordan%40example.com?secret=JBSWY3DPEHPK3PXP&issuer=Substratal&digits=6&period=30",
  "expires_in": 600
}

The client renders otpauth_uri as a QR code itself; the API never serves the secret through a URL. Enrollment is pending until confirmed; calling this again replaces a pending secret. 409 mfa_already_enabled if already confirmed.

POST /v1/users/{id}/mfa/totp/confirm 

// Request
{ "code": "492039" }

// Response — 200
{
  "mfa_enabled": true,
  "recovery_codes": ["7hq2-kx9m-a4vd", "p3nc-8wz1-qt6r", "..."]
}

Ten recovery codes, shown once — stored hashed. Writes user.mfa_enabled and emails a notice. 401 invalid_mfa_code on a wrong code; 409 mfa_enrollment_expired if the pending secret is older than 10 minutes.

POST /v1/users/{id}/mfa/totp/disable 

// Request — current TOTP or a recovery code
{ "code": "492039" }

// Response — 204

Writes user.mfa_disabled, emails a notice.

DELETE /v1/users/{id}/mfa/totp — support reset

Requires users.manage. For a User who has lost their device and their recovery codes; support verifies identity out of band first. Revokes every session. Writes user.mfa_reset. Destructive — see MCP Server → Tool annotations.

Sessions

GET /v1/users/{id}/sessions 

// Response — 200
{
  "data": [
    {
      "id": "ses_01JAG8K4Q9R0S1T2U3V4W5X6Y8",
      "created_at": "2026-10-02T09:41:03Z",
      "last_seen_at": "2026-10-05T08:12:44Z",
      "expires_at": "2026-12-31T09:41:03Z",
      "ip_address": "203.0.113.24",
      "user_agent": "TimeTrack/2.4 (iOS 19.0)",
      "amr": ["pwd", "otp"],
      "current": true
    }
  ],
  "page": { "next_cursor": null, "has_more": false }
}

DELETE /v1/users/{id}/sessions/{sessionId}

204. Same effect as logout for that one session.

POST /v1/auth/sso/{provider}/callback

Reserved. Returns 501 not_implemented until the SSO broker integration ships (see Native auth and per-Organization SSO). When live, it creates or matches a method: sso UserIdentity against the Organization’s SSOConnection and returns an AuthSession — SSO is a different way to obtain a session, not a different kind of session.

Signing keys (JWKS) 

GET https://api.substratalapps.com/.well-known/jwks.json

{
  "keys": [
    { "kty": "RSA", "kid": "sk_202610", "use": "sig", "alg": "RS256", "n": "0vx7agoebGcQSuu...", "e": "AQAB" }
  ]
}
  • RS256, 2048-bit keys, held in AWS KMS (the private key never leaves KMS — signing is a KMS Sign call).
  • Every token’s JWT header carries kid. Applications verify against the matching key and should cache the JWKS for up to 1 hour, re-fetching on an unknown kid.
  • Rotated every 90 days. A new key is published 7 days before it starts signing, and a retired key stays published for 7 days after its last use (longer than any token’s TTL), so a verifying Application never sees an unknown kid in normal operation.
  • Verification checklist for an Application: signature against JWKS, iss equals https://api.substratalapps.com, aud equals its own application_id, exp in the future (allow ≤60 s clock skew), entitlement_status is active.

GET /.well-known/openid-configuration returns issuer, jwks_uri, token_endpoint (/v1/auth/oauth/token), grant_types_supported (authorization_code, refresh_token), and code_challenge_methods_supported (S256). It is metadata for standard libraries, not a claim of full OpenID Connect conformance (there is no id_token or userinfo endpoint).

Errors specific to this resource

Code Status When
invalid_credentials 401 Login or password change with a wrong password/unknown email.
account_suspended 403 The User is suspended.
too_many_attempts 429 Account lockout after repeated failures.
email_taken 409 Signup with an email already in use.
weak_password 422 Password fails the policy.
token_invalid 400 Verification, reset, or invitation token is expired, used, or unknown.
invalid_mfa_code 401 Wrong or reused TOTP/recovery code.
mfa_token_invalid 401 MFA challenge expired or exhausted.
mfa_already_enabled / mfa_not_applicable / mfa_enrollment_expired 409 See MFA.
refresh_token_reused 401 A rotated refresh token was presented again — session revoked.
session_revoked 401 The session was logged out, reset, or the User suspended/deleted.
user_token_required 400 An endpoint that acts as a User was called with an API Key.
entitlement_required 403 App-token issuance for a User without active access.
application_not_available 403 App-token issuance for an Application not approved.
redirect_uri_not_registered 422 Authorization code requested for an unregistered redirect_uri.
not_implemented 501 SSO callback before the broker integration exists.

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Substratal Apps Platform API — living specification. This site is the system of record; see git history for how it has changed over time.

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