# POST /api/v1/advisory-firms/{firm_id}/businesses/{business_id}/invite-client

> Invite a client user to a business

- **Tag:** advisory-firms
- **Operation ID:** `invite_client_to_business_api_v1_advisory_firms__firm_id__businesses__business_id__invite_client_post`

## Description

Invite a user by email to access a client business. If the user already exists they are added immediately; otherwise an invitation email is sent and they are added on signup.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `firm_id` (path, string, required)
- `business_id` (path, string, required)

## Request body

Schema: `InviteClientRequest`

- `email` (string · required) — Email address of the client to invite.
- `first_name` (string) — Optional first name to personalize the invitation.
- `last_name` (string) — Optional last name to personalize the invitation.
- `message` (string) — Optional personal message from the inviter included in the email.

## Responses

### 201 — Successful Response

Schema: `InviteClientResponse`

- `status` (string · required) — 'added' if user existed and was added, 'invited' if invitation email was sent.
- `reason` (string) — Why this branch was chosen. Lets the UI render the right confirmation message without parsing 'message'.
- `message` (string · required)
- `email_sent` (boolean) — Whether the notification email was sent successfully.

### 400 — Bad Request - Invalid input

### 401 — Unauthorized - Authentication required

### 403 — Forbidden - Insufficient permissions

### 404 — Not Found - Resource does not exist

### 409 — Conflict - Resource already exists

### 422 — Validation Error

Schema: `HTTPValidationError`

- `detail` (array · ValidationError) → `ValidationError`
  - `loc` (array · string | integer · required)
  - `msg` (string · required)
  - `type` (string · required)
  - `input` (object)
  - `ctx` (object)

## Code samples

### cURL

```bash
curl -X POST 'https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/{business_id}/invite-client' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "email": "string"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/{business_id}/invite-client', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "email": "string"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {
  "email": "string"
}

response = httpx.post("https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/{business_id}/invite-client", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/advisory-firms/invite-client-to-business
- OpenAPI slice: https://www.ondayzero.com/docs/reference/advisory-firms/invite-client-to-business/openapi.json
- Other endpoints in **advisory-firms**: https://www.ondayzero.com/docs/reference/advisory-firms