# POST /api/v1/inventory/transfers/{transfer_id}/items

> Add item to transfer

- **Tag:** inventory:transfers
- **Operation ID:** `add_transfer_item_api_v1_inventory_transfers__transfer_id__items_post`

## Description

Add an item to an existing transfer. Only works for draft/pending transfers.

## Authentication

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

## Parameters

- `transfer_id` (path, string, required)

## Request body

Schema: `TransferItemAddRequest`

- `variant_id` (string · required) — Variant ID to add
- `quantity` (integer · required) — Quantity to transfer
- `notes` (string)

## Responses

### 201 — Successful Response

Schema: `TransferResponse`

- `id` (string · required)
- `business_id` (string · required)
- `transfer_number` (string)
- `status` (TransferStatusEnum · required) → `TransferStatusEnum`
- `from_location_id` (string · required)
- `to_location_id` (string · required)
- `from_location` (LocationSummary)
- `to_location` (LocationSummary)
- `transfer_date` (string · date)
- `expected_arrival_date` (string · date)
- `received_date` (string · date)
- `tracking_number` (string)
- `carrier` (string)
- `notes` (string)
- `items` (array · TransferItemResponse) → `TransferItemResponse`
  - `variant_id` (string · required) — Variant being transferred
  - `quantity` (integer · required) — Quantity to transfer
  - `notes` (string)
  - `id` (string · required)
  - `transfer_id` (string · required)
  - `received_quantity` (integer)
  - `has_damage` (boolean)
  - `damage_notes` (string)
  - `final_quantity` (integer · required)
  - `has_discrepancy` (boolean · required)
  - `discrepancy_amount` (integer · required)
  - `created_at` (string · date-time · required)
  - `updated_at` (string · date-time · required)
  - `variant_name` (string)
  - `variant_sku` (string)
- `total_items` (integer)
- `total_quantity` (integer)
- `total_received_quantity` (integer)
- `has_discrepancy` (boolean)
- `is_editable` (boolean)
- `can_ship` (boolean)
- `can_receive` (boolean)
- `can_cancel` (boolean)
- `shipped_by_user_id` (string)
- `received_by_user_id` (string)
- `version` (integer)
- `created_at` (string · date-time · required)
- `updated_at` (string · date-time · required)

### 400 — Bad Request - Invalid input

### 401 — Unauthorized - Authentication required

### 403 — Forbidden - Insufficient permissions

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

### 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/inventory/transfers/{transfer_id}/items' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "variant_id": "string",
  "quantity": 0
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/inventory/transfers/{transfer_id}/items', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "variant_id": "string",
  "quantity": 0
}),
});
const data = await response.json();
```

### Python

```python
import httpx

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

payload = {
  "variant_id": "string",
  "quantity": 0
}

response = httpx.post("https://api.ondayzero.com/api/v1/inventory/transfers/{transfer_id}/items", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/inventory-transfers/add-transfer-item
- OpenAPI slice: https://www.ondayzero.com/docs/reference/inventory-transfers/add-transfer-item/openapi.json
- Other endpoints in **inventory:transfers**: https://www.ondayzero.com/docs/reference/inventory-transfers