## POST /api/v2/domains/{id}/contacts

**Update domain contacts**

Update one or more contact roles on a domain. This is an update endpoint, not a contact creation endpoint: send at least one of `registrant`, `admin`, `tech`, or `billing`, and only the documented camelCase v2 contact fields. Unknown fields and legacy internal contact aliases are rejected on this per-domain route. For .se, .nu, and .test domains, changing the registrant personal or organisation number requires identity verification; when the identifier is preserved instead of applied, the response reports this in `updateOutcome.registrantRegistrationIdentifierApplied: false` and `updateOutcome.registrantRegistrationIdentifierBlockedReason: "identity_verification_required"`. Successful responses echo the full contacts payload with current action gates.

### Related Endpoints

- `GET /api/v2/domains/{id}/contacts`: Get domain contacts
- `GET /api/v2/domains/{id}`: Get domain details
- `PATCH /api/v2/domains/{id}`: Update domain settings

### Headers

- `Accept`: application/json
- `Authorization`: Bearer YOUR_API_KEY
- Required API scope: `write:domains`
- `Content-Type`: application/json

### Parameters

- `id` (path, string, required): Public domain ID. Get it from GET /api/v2/domains `data[].id`. Do not invent this value; use the exact ID returned by the referenced API response. Example: `dom_01hxa3b4c5d6e7f8g9h0j1k2m3`

### Request Body

- `registrant` (null, optional)
- `admin` (null, optional)
- `tech` (null, optional)
- `billing` (null, optional)

### Request Examples

#### Update registrant contact fields

```bash
curl -X POST "https://cloud.hostup.se/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/contacts" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "registrant": {
      "firstName": "Anna",
      "lastName": "Svensson",
      "companyName": "Example AB",
      "email": "anna@example.se",
      "phoneNumber": "+46700000000",
      "street": "Examplegatan 1",
      "city": "Stockholm",
      "postalCode": "12345",
      "countryCode": "SE"
    }
  }'
```

```json
{
  "registrant": {
    "firstName": "Anna",
    "lastName": "Svensson",
    "companyName": "Example AB",
    "email": "anna@example.se",
    "phoneNumber": "+46700000000",
    "street": "Examplegatan 1",
    "city": "Stockholm",
    "postalCode": "12345",
    "countryCode": "SE"
  }
}
```

#### Update multiple contact roles

```bash
curl -X POST "https://cloud.hostup.se/api/v2/domains/dom_01hxa3b4c5d6e7f8g9h0j1k2m3/contacts" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json" \
  -H "Content-Type: application/json" \
  -d '{
    "registrant": {
      "email": "owner@example.se",
      "phoneNumber": "+46700000000"
    },
    "tech": {
      "email": "tech@example.se",
      "phoneNumber": "+46700000001",
      "countryCode": "SE"
    }
  }'
```

```json
{
  "registrant": {
    "email": "owner@example.se",
    "phoneNumber": "+46700000000"
  },
  "tech": {
    "email": "tech@example.se",
    "phoneNumber": "+46700000001",
    "countryCode": "SE"
  }
}
```

### Response Schema

- `registrant` (null, optional)
- `admin` (null, optional)
- `tech` (null, optional)
- `billing` (null, optional)
- `draft` (boolean, optional): True for pending-registration Swedish TLD drafts where registrant contact data can still be edited before payment or registry sync. Example: `false`
- `serviceStatus` (string, optional): Canonical v2 service lifecycle status for the domain contact resource. Example: `active`
  Allowed values: active, suspended, expired, pending, cancelled, terminated, unknown
- `actions` (object, optional)
- `actions.canEditContacts` (object, required): False while contact changes are locked, for example during an in-progress transfer.
- `actions.canEditContacts.allowed` (boolean, required) Example: `true`
- `actions.canEditContacts.reason` (string,null, required) Example: `null`
- `actions.canEditContacts.code` (string,null, optional): Machine-readable reason code when an action is blocked. Example: `pending_order`
- `actions.requiresIdentityVerification` (object, required): `allowed: true` means identity verification, currently BankID for .se/.nu/.test registrant identifier changes, is required before the registrant personal or organisation number can be updated.
- `actions.requiresIdentityVerification.allowed` (boolean, required) Example: `true`
- `actions.requiresIdentityVerification.reason` (string,null, required) Example: `null`
- `actions.requiresIdentityVerification.code` (string,null, optional): Machine-readable reason code when an action is blocked. Example: `pending_order`
- `updateOutcome` (null, optional)

### Responses

#### 200 - Contacts updated. Wrapperless v2 response.
```json
{
  "registrant": {
    "firstName": "Anna",
    "lastName": "Svensson",
    "companyName": "Example AB",
    "email": "anna@example.se",
    "phoneNumber": "+46700000000",
    "street": "Examplegatan 1",
    "address2": "5",
    "city": "Goteborg",
    "postalCode": "413 04",
    "state": "Vastra Gotaland",
    "countryCode": "SE",
    "registrationIdentifier": {
      "value": "559290-1325",
      "countryCode": "SE",
      "type": "organization_number"
    }
  },
  "admin": null,
  "tech": null,
  "billing": null,
  "draft": false,
  "serviceStatus": "active",
  "actions": {
    "canEditContacts": {
      "allowed": true,
      "reason": null
    },
    "requiresIdentityVerification": {
      "allowed": true,
      "reason": "BankID verification is required before updating the registrant's personal or organisation number."
    }
  },
  "updateOutcome": {
    "syncTriggered": false,
    "orderActivation": null,
    "registrantRegistrationIdentifierApplied": false,
    "registrantRegistrationIdentifierBlockedReason": "identity_verification_required"
  }
}
```

#### 400 - Invalid request. The response body is an RFC 7807 Problem Details document.
```json
{
  "type": "https://developer.hostup.se/errors/invalid_request",
  "title": "Invalid request",
  "status": 400,
  "detail": "The request body failed validation.",
  "code": "invalid_request",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z",
  "errors": [
    {
      "pointer": "/items/0/domainName",
      "detail": "`domainName` is required.",
      "code": "invalid_request"
    }
  ]
}
```

#### 401 - Unauthorized. Authentication is required.
```json
{
  "type": "https://developer.hostup.se/errors/unauthorized",
  "title": "Unauthorized",
  "status": 401,
  "detail": "Authentication is required.",
  "code": "unauthorized",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 403 - Forbidden. The caller lacks a required scope or does not own the resource.
```json
{
  "type": "https://developer.hostup.se/errors/forbidden",
  "title": "Forbidden",
  "status": 403,
  "detail": "The caller lacks a required scope or does not own the resource.",
  "code": "forbidden",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 404 - Not found. The resource does not exist or is not owned by the caller.
```json
{
  "type": "https://developer.hostup.se/errors/not_found",
  "title": "Not found",
  "status": 404,
  "detail": "The requested resource could not be found.",
  "code": "not_found",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 429 - Rate limited. Retry after the limit resets. 429 responses include `Retry-After` seconds plus `X-RateLimit-*` headers.
```json
{
  "type": "https://developer.hostup.se/errors/rate_limit_exceeded",
  "title": "Too many requests",
  "status": 429,
  "detail": "Too many requests. Retry after the limit resets.",
  "code": "rate_limit_exceeded",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```

#### 500 - Internal error. Retry later or contact support if the issue persists.
```json
{
  "type": "https://developer.hostup.se/errors/internal_error",
  "title": "Internal server error",
  "status": 500,
  "detail": "An unexpected error occurred. Retry later or contact support if the issue persists.",
  "code": "internal_error",
  "instance": "/api/v2/resource",
  "requestId": "req_01hxa3b4c5d6e7f8g9h0j1k2m3",
  "timestamp": "2026-04-27T12:34:56.000Z"
}
```