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v5

OpenAPI 3.1.0Proprietary2026-08-011476181.4 MB
Embedded Wallet Auth

Re-issue an authentication credential challenge

Re-issue the challenge for an existing authentication credential.

For EMAIL_OTP and SMS_OTP credentials, this triggers a new one-time password to the contact on file and returns a fresh otpEncryptionTargetBundle for the client to HPKE-encrypt the OTP attempt against. After the user receives the new OTP, build the encryptedOtpBundle under the new target bundle and call POST /auth/credentials/{id}/verify to begin the secure OTP login flow.

OAUTH credentials do not have a challenge step. To authenticate or reauthenticate an OAuth credential, call POST /auth/credentials/{id}/verify with a fresh OIDC token and a clientPublicKey.

For PASSKEY credentials, this issues a fresh Grid reauthentication challenge. The request body must carry the client's ephemeral clientPublicKey so Grid can bake it into the session-creation payload the returned challenge is computed from — this seals the resulting session signing key to the client. The response is a PasskeyAuthChallenge — the passkey auth method fields plus the WebAuthn credentialId, new challenge, requestId, and expiresAt. The challenge value is the lowercase hex-encoded SHA-256 digest of the canonical session-creation body, not a base64url string. The client base64url-decodes credentialId for allowCredentials[].id and UTF-8 encodes challenge (for example, new TextEncoder().encode(challenge)) as the WebAuthn challenge in navigator.credentials.get(), then submits the resulting assertion to POST /auth/credentials/{id}/verify with Request-Id: <requestId> to receive a session.

post/auth/credentials/{id}/challenge

Path parameters

idstring required

The id of the authentication credential to re-challenge (the id field of the AuthMethod returned from POST /auth/credentials).

Request body

clientPublicKeystring

Required for PASSKEY credentials. Client-generated P-256 public key, hex-encoded in uncompressed SEC1 format (04 prefix followed by the 32-byte X and 32-byte Y coordinates; 130 hex characters total). The matching private key must remain on the client. Grid bakes this key into the session-creation payload that the returned challenge is computed from, so the resulting session signing key is sealed to the client. Ignored for EMAIL_OTP and SMS_OTP.

Example request

{
  "clientPublicKey": "04f45f2a22c908b9ce09a7150e514afd24627c401c38a4afc164e1ea783adaaa31d4245acfb88c2ebd42b47628d63ecabf345484f0a9f665b63c54c897d5578be2"
}

Response

Challenge re-issued for the authentication credential. For EMAIL_OTP and SMS_OTP the body is a plain AuthMethod and a new OTP has been sent. For PASSKEY the body is a PasskeyAuthChallenge carrying the passkey credentialId, freshly issued challenge, requestId, and expiresAt required to complete reauthentication via POST /auth/credentials/{id}/verify.

OR

Example response

{
  "id": "AuthMethod:019542f5-b3e7-1d02-0000-000000000001",
  "accountId": "InternalAccount:019542f5-b3e7-1d02-0000-000000000002",
  "credentialId": "KEbWNCc7NgaYnUyrNeFGX9_3Y-8oJ3KwzjnaiD1d1LVTxR7v3CaKfCz2Vy_g_MHSh7yJ8yL0Pxg6jo_o0hYiew",
  "nickname": "example@lightspark.com",
  "createdAt": "2026-04-08T15:30:01Z",
  "updatedAt": "2026-04-08T15:35:00Z",
  "otpEncryptionTargetBundle": "{\"version\":\"v1.0.0\",\"data\":\"7b227461726765745075626c6963...\",\"dataSignature\":\"30450221...\",\"enclaveQuorumPublic\":\"04a1b2c3...\"}"
}