Embedded Wallet Auth

Re-issue an authentication credential challenge

Changed on

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 — send a compressed key for the recommended client-held-key model, where the client retains the matching private key as the resulting session signing key, or an uncompressed key for the deprecated legacy flow. 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

Request

  • Base URL: https://api.lightspark.com/grid/2025-10-13
  • URL: https://api.lightspark.com/grid/2025-10-13/auth/credentials/{id}/challenge
  • Auth: HTTP basic

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; the matching private key is retained on the client. Send a compressed SEC1 key (02/03 prefix followed by the 32-byte X coordinate; 66 hex characters) for the recommended client-held-key model, where that private key becomes the session signing key. Send an uncompressed SEC1 key (04 prefix followed by the 32-byte X and 32-byte Y coordinates; 130 hex characters) for the deprecated legacy flow, where Grid seals the session signing key to it instead. Grid bakes this public key into the session-creation payload that the returned challenge is computed from. Ignored for EMAIL_OTP and SMS_OTP.

Example request

{
  "clientPublicKey": "02f45f2a22c908b9ce09a7150e514afd24627c401c38a4afc164e1ea783adaaa31"
}

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. When the OTP send's underlying wallet-provider activity is still in flight, the body is instead a WalletOperationProcessing carrying a PROCESSING status — re-request the challenge until the send settles; the backend also reconciles it to terminal on its own.

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...\"}"
}

Changes

  • 3966e5d38aadRevision changes
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    • warning

      added the new ACCOUNT_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new AUTH_METHOD_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new CUSTOMER_NOT_FOUND enum value to the response property for the response status

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      added the new DOCUMENT_HOLDER_NOT_FOUND enum value to the response property for the response status

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      added the new INSUFFICIENT_FUNDS enum value to the response property for the response status

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      added the new NOT_FOUND enum value to the response property for the response status

    • warning

      added the new PAYMENT_URL_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new PLATFORM_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new QUOTE_EXPIRED enum value to the response property for the response status

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      added the new QUOTE_RATE_UNAVAILABLE enum value to the response property for the response status

    • warning

      added the new REQUEST_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new SESSION_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new STABLECOIN_AMOUNT_NOT_REPRESENTABLE enum value to the response property for the response status

    • warning

      added the new STABLECOIN_BURN_SOURCE_NOT_SUPPORTED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_EXTERNAL_ACCOUNT_LINK_FAILED enum value to the response property for the response status

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      added the new STABLECOIN_EXTERNAL_ACCOUNT_LINK_METHOD_REQUIRED enum value to the response property for the response status

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      added the new STABLECOIN_EXTERNAL_ACCOUNT_NOT_FOUND enum value to the response property for the response status

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      added the new STABLECOIN_EXTERNAL_ACCOUNT_NOT_LINKED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_EXTERNAL_ACCOUNT_NOT_SUPPORTED enum value to the response property for the response status

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      added the new STABLECOIN_EXTERNAL_ACCOUNT_PROVIDER_LINK_FAILED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_EXTERNAL_ACCOUNT_PROVIDER_LINK_REQUIRED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_GRID_OPERATIONS_NOT_ENABLED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_NOT_FOUND enum value to the response property for the response status

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      added the new STABLECOIN_NOT_PROVISIONED enum value to the response property for the response status

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      added the new STABLECOIN_OPERATION_NOT_FOUND enum value to the response property for the response status

    • warning

      added the new STABLECOIN_OPERATION_NOT_SUPPORTED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_PROVIDER_ERROR enum value to the response property for the response status

    • warning

      added the new STABLECOIN_PROVIDER_SOURCE_NOT_LINKED enum value to the response property for the response status

    • warning

      added the new STABLECOIN_VERIFICATION_FAILED enum value to the response property for the response status

    • warning

      added the new VERIFICATION_NOT_FOUND enum value to the response property for the response status

    • info

      added the required property to the response with the status

    • info

      added the required property to the response with the status

    • info

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  • 8964d9c7b6f9Revision changes
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      added to the response body anyOf list for the response status

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