# Send a verification code

`POST /fapi/v1/verifications` · called from the environment's sign-in host

Sends a message with a 6-digit code and a verification link to one of the authenticated user's unverified email addresses, and returns the id of the code attempt. The user types the code with [Enter a verification code](/docs/api/fapi/verifications/attempt), or opens the link. Both are valid for 10 minutes. A new message replaces the address's open verification: the code and link of an earlier message stop working. No re-authentication is needed, because only the address's mailbox receives the code. Requires the authenticated user's `__Host-idp_session` cookie; if the cookie is missing, expired, or revoked, returns `401 unauthenticated`. A first-party app on another origin can instead send its front API access token (`Authorization: DPoP <token>` with a DPoP proof; see [Front API access token](/docs/api/fapi/front-api-token)).

## Request

Headers:

| Header | Required | Description |
| --- | --- | --- |
| `Idp-Client` | yes | SDK identifier. |
| `Origin` | yes | Must be exactly `https://<sign-in host>`. |
| `Content-Type` | yes | `application/json`. |

Body:

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `email_id` | string (UUID) | yes | The address's `id` from [List email addresses](/docs/api/fapi/me/emails/list). |

## Response

`202 Accepted`:

| Field | Type | Description |
| --- | --- | --- |
| `id` | string (UUID) | The code attempt's id, used in the `:attempt` path. It is not a secret. |
| `expires_at` | string (RFC 3339) | When the code and link stop working. |

```json
{"id": "0190a5c4-1b2c-7d3e-8f40-5162738400ff", "expires_at": "2026-10-12T10:10:00Z"}
```

## Errors

| Status | Code | When |
| --- | --- | --- |
| 400 | `malformed_request` | The body is not valid JSON. |
| 400 | `unknown_field` | The body has a field other than `email_id`. |
| 401 | `unauthenticated` | No valid session cookie. |
| 403 | `origin_not_allowed` | `Origin` is missing or wrong. |
| 404 | `not_found` | `email_id` is not one of the user's addresses. |
| 409 | `conflict` | The address is already verified. |
| 413 | `payload_too_large` | The body is too large. |
| 415 | `unsupported_media_type` | `Content-Type` is not `application/json`. |
| 422 | `validation_failed` | `email_id` is missing. |
| 429 | `verification_rate_limited` | 5 verification messages were sent to this address in the last hour, including the one sent when it was added; try again later. |

## Example

```bash
curl -X POST https://example.keenauth.app/fapi/v1/verifications \
  -H "Idp-Client: my-app/1.0.0 (node/22.0.0)" \
  -H "Origin: https://example.keenauth.app" \
  -H "Content-Type: application/json" \
  -b cookies.txt \
  -d '{"email_id": "0190a5c4-1b2c-7d3e-8f40-516273849abc"}'
```

## Personal data

This endpoint carries personal data: end-user profile. [Personal data in the KeenAuth APIs](/docs/policies/personal-data) describes what is stored, how long it is kept and how it is deleted. Do not send special categories of personal data (health, biometric data, religion, political opinions, sexual orientation) in any field.