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Start passkey authentication for a pending login

POST
/v1/auth/mfa/challenge
curl --request POST \
--url https://api.aetherpush.com/v1/auth/mfa/challenge \
--header 'Content-Type: application/json' \
--data '{ "pendingToken": "example" }'

Exchanges a pending login token (from a mfaRequired login response) for WebAuthn authentication options. Overlapping calls leave each returned challenge verifiable until it expires or is used; the server keeps at most five live authentication challenges per account and consumes the oldest when that cap is exceeded. Does not count against the pending login’s five-attempt budget; only verification calls do. Rate limited like login: 5 failed attempts per client address per 15 minutes.

Media typeapplication/json
object
pendingToken
required
string

Example generated

{
"pendingToken": "example"
}

WebAuthn authentication options to pass to the browser.

Media typeapplication/json
object
options
required

WebAuthn PublicKeyCredentialRequestOptionsJSON, as produced by SimpleWebAuthn’s generateAuthenticationOptions(). Pass it to startAuthentication() from @simplewebauthn/browser.

object
key
additional properties
any

Example generated

{
"options": {}
}

Pending token missing, or the account has no passkeys.

Media typeapplication/json
Error

Standard error envelope. code is the stable machine identifier for client branching and i18n. The wording of error is a human-readable fallback and is not part of the contract. Specialized responses keep narrower code enums where clients already branch on them.

object
error
required

Human-readable error message.

string
code
required

Stable machine code. Prefer this over matching on error. The values this API can answer with are listed in the ApiErrorCode schema of the raw document at https://api.aetherpush.com/openapi.yaml. The field stays an open string here so that a release adding a value does not invalidate this response.

string
requestId

Unique identifier for the request, also exposed as the X-Request-Id response header.

string

Example

{
"error": "The requested resource was not found.",
"code": "not_found",
"requestId": "req_abc123"
}

The pending login is invalid, consumed, or expired.

Media typeapplication/json
Error

Standard error envelope. code is the stable machine identifier for client branching and i18n. The wording of error is a human-readable fallback and is not part of the contract. Specialized responses keep narrower code enums where clients already branch on them.

object
error
required

Human-readable error message.

string
code
required

Stable machine code. Prefer this over matching on error. The values this API can answer with are listed in the ApiErrorCode schema of the raw document at https://api.aetherpush.com/openapi.yaml. The field stays an open string here so that a release adding a value does not invalidate this response.

string
requestId

Unique identifier for the request, also exposed as the X-Request-Id response header.

string

Example

{
"error": "The requested resource was not found.",
"code": "not_found",
"requestId": "req_abc123"
}

Too many MFA attempts.

Media typeapplication/json
RateLimitError

Returned with HTTP 429 when an endpoint-specific rate limit is hit, including the per-tenant management API budget. Not the process-wide address limiter (see GlobalAddressRateLimitErrorResponse). retryAfterSeconds indicates how long the client should wait before retrying, and matches the Retry-After header when that header is set. code names the limit that fired so clients can translate without matching on error.

object
error
required
string
code
required
string
retryAfterSeconds
required
integer
>= 1
requestId
string

Example

{
"error": "Too many login attempts. Please try again later.",
"code": "too_many_login_attempts",
"retryAfterSeconds": 900,
"requestId": "req_abc123"
}

Passkeys are not configured on this server.

Media typeapplication/json
Error

Standard error envelope. code is the stable machine identifier for client branching and i18n. The wording of error is a human-readable fallback and is not part of the contract. Specialized responses keep narrower code enums where clients already branch on them.

object
error
required

Human-readable error message.

string
code
required

Stable machine code. Prefer this over matching on error. The values this API can answer with are listed in the ApiErrorCode schema of the raw document at https://api.aetherpush.com/openapi.yaml. The field stays an open string here so that a release adding a value does not invalidate this response.

string
requestId

Unique identifier for the request, also exposed as the X-Request-Id response header.

string

Example

{
"error": "The requested resource was not found.",
"code": "not_found",
"requestId": "req_abc123"
}