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POST Complete second-factor verification

/api/v1/auth/mfa

The first login proof creates only a browser-bound five-minute challenge. Submit an authenticator code or one-use recovery code. No usable session exists before success. At most five incorrect attempts per challenge; additional account and network limits apply. GET inspects the current challenge; DELETE cancels it. Reauthentication additionally requires the existing session and CSRF.

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Access and permissions

The first login proof creates only a browser-bound five-minute challenge. Submit an authenticator code or one-use recovery code. No usable session exists before success. At most five incorrect attempts per challenge; additional account and network limits apply. GET inspects the current challenge; DELETE cancels it. Reauthentication additionally requires the existing session and CSRF.

No account sign-in is required. Any listed browser-origin checks and rate limits still apply.

Parameters and headers

No path, query or additional request-header parameters.

Request body

FieldType and limitsRequiredMeaning
$object; {"additionalProperties":false}Yes—
$.codestring; {"maxLength":32}Yes—

Responses

HeaderType and limitsMeaning
Cache-ControlJSON; {"const":"no-store"}—

application/json

FieldType and limitsRequiredMeaning
$MFARequired | EntryAuthenticated | EntryIdleYes—
$ (oneOf 1)MFARequiredNo—
$ (oneOf 1).statusJSON; {"const":"mfa_required"}Yes—
$ (oneOf 1).expires_atstring; {"format":"date-time"}Yes—
$ (oneOf 1).return_tostringYes—
$ (oneOf 1).emailstringNo—
$ (oneOf 1).providerstringNo—
$ (oneOf 1).email_verifiedbooleanNo—
$ (oneOf 1).mail_verifiedbooleanNo—
$ (oneOf 2)EntryAuthenticatedNo—
$ (oneOf 2).account_idstring; {"format":"uuid"}YesUUID of the owning or acting account, as specified by this operation.
$ (oneOf 2).emailstring; {"format":"email"}YesEmail address of the account or operation target. Confirmation rules depend on the operation.
$ (oneOf 2).operatorbooleanYesWhether the account has the admin role; this does not bypass action-code or last-admin checks.
$ (oneOf 2).return_tostringYesAllowed local destination after sign-in. External and unsafe destinations are rejected.
$ (oneOf 2).statusJSON; {"const":"authenticated"}Yes—
$ (oneOf 3)EntryIdleNo—
$ (oneOf 3).statusJSON; {"const":"idle"}Yes—
Stable error codes
unauthorized
invalid_credential
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
invalid_passkey
invalid_origin
forbidden
confirmation_required
invalid_confirmation
invalid_csrf
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
passkey_limit
passkey_exists
passkey_unavailable
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
body_too_large
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
invalid_name
invalid_request
invalid_json
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
rate_limited
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}
Stable error codes
passkeys_unavailable
auth_unavailable
HeaderType and limitsMeaning
Cache-Controlstring; {"pattern":"(?:^|,\\s*)no-store(?:,|$)"}Private API responses prohibit storage. Public OAuth metadata is cached for 300 seconds; live streams additionally prohibit transformation.
Content-Languagestring; {"enum":["en","de"]}Language of human-readable response text, resolved from Accept-Language or the documented browser preference. Technical codes and identifiers remain stable.
Referrer-PolicyJSON; {"enum":["strict-origin-when-cross-origin","no-referrer"]}The default referrer policy is strict-origin-when-cross-origin. Provider-login responses use no-referrer to protect login parameters.
VarystringResponses vary by Accept-Language; browser-rendered responses can also vary by the preference cookie.
X-Content-Type-OptionsJSON; {"const":"nosniff"}The browser must use the declared content type.
X-Frame-OptionsJSON; {"const":"DENY"}The response must not be embedded in a frame.
X-Request-IDstringServer-generated request identifier. Include this when reporting an error; inbound values are not trusted.

application/problem+json

FieldType and limitsRequiredMeaning
$ProblemYes—
$.codestringYesStable machine-readable error code
$.detailstringYesShort localized explanation without internal error details
$.instancestringYesUnique relative identifier /api/v1/requests/{request_id}; not a retrievable resource
$.messagestringYesTemporarily identical to detail for existing clients
$.message_keystringYesStable translation key for changing the displayed language without another request
$.message_paramsobject; {"additionalProperties":true}YesNamed, safely rendered message parameters; never arbitrary HTML
$.request_idstring; {"pattern":"^[0-9a-f]{32}$"}YesServer-generated diagnostic identifier. It contains no login token or credential.
$.statusinteger; {"maximum":599,"minimum":400}Yes—
$.titlestringYesLocalized HTTP status title
$.typestring; {"const":"about:blank"}Yes—
json
{
  "code": "demo",
  "detail": "Demo error detail; inspect the documented code.",
  "instance": "demo",
  "message": "Demo error detail; inspect the documented code.",
  "message_key": "errors.requestFailed",
  "message_params": {},
  "request_id": "00000000000000000000000000000000",
  "status": 403,
  "title": "Demo error",
  "type": "about:blank"
}

Retries and asynchronous work

This operation reads or validates without applying a resource mutation. Respect rate limits and credential lifetime.

Request examples

Replace demo IDs, timestamps and placeholders with your own values. For a retry, keep the same IDs, time and content. These examples do not run requests on this page.

Keep login links, codes, cookies and keys private. Do not print them in logs or share them in support requests.

shell
curl --fail --silent --show-error --request POST "https://metribeacon.com/api/v1/auth/mfa" --header 'Origin: https://metribeacon.com' --header 'Content-Type: application/json' --data '{"code":"123456"}'
python
import urllib.request
request = urllib.request.Request('https://metribeacon.com/api/v1/auth/mfa', method='POST', headers={'Origin': 'https://metribeacon.com', 'Content-Type': 'application/json'}, data=b'{"code":"123456"}')
with urllib.request.urlopen(request) as response:
    print(response.status)
javascript
const response = await fetch("https://metribeacon.com/api/v1/auth/mfa", {method:"POST", credentials:"same-origin", headers:{"Content-Type": "application/json"}, body:"{\"code\":\"123456\"}"});
console.log(response.status);
go
package main
import("fmt";"net/http";"strings")
func main(){ request,_:=http.NewRequest("POST","https://metribeacon.com/api/v1/auth/mfa",strings.NewReader("{\"code\":\"123456\"}"));
request.Header.Set("Origin","https://metribeacon.com");
request.Header.Set("Content-Type","application/json");
response,err:=http.DefaultClient.Do(request);if err!=nil{panic(err)};defer response.Body.Close();fmt.Println(response.StatusCode) }

Related guides

  • HTTP API, OAuth and MCP

    Find the user API endpoints, their permissions, fields, examples and response formats.

  • GET Complete second-factor verification

    The first login proof creates only a browser-bound five-minute challenge. Submit an authenticator code or one-use recovery code. No usable session exists before success. At most five incorrect attempts per challenge; additional account and network limits apply. GET inspects the current challenge; DELETE cancels it. Reauthentication additionally requires the existing session and CSRF.

  • DELETE Complete second-factor verification

    The first login proof creates only a browser-bound five-minute challenge. Submit an authenticator code or one-use recovery code. No usable session exists before success. At most five incorrect attempts per challenge; additional account and network limits apply. GET inspects the current challenge; DELETE cancels it. Reauthentication additionally requires the existing session and CSRF.

  • POST Complete second-factor verification

    The first login proof creates only a browser-bound five-minute challenge. Submit an authenticator code or one-use recovery code. No usable session exists before success. At most five incorrect attempts per challenge; additional account and network limits apply. GET inspects the current challenge; DELETE cancels it. Reauthentication additionally requires the existing session and CSRF.