> A field name that is not in the writable set is no longer dropped silently — the request is rejected with `400 INVALID_PARAMS` and the error text lists the writable names. Read-only fields that appear in product-row responses (`priceAccount`, `ownerId`, `storeId` and others) are still accepted and ignored, so an object read via GET can be sent back as is.

> A row whose fields are unchanged keeps its `id`. A modified row comes back with a new `id` even when the previous identifier is sent in the body. To edit a row and keep its `id`, use `PATCH /v1/items/:entityTypeId/:id/products/:rowId`.


Use the `entityTypeId` field from [`GET /v1/smart-processes`](/docs/entities/smart-processes/list) in the `/v1/items/:entityTypeId` path. The type record's internal `id` is a different identifier. For example, if a type is returned as `{ "id": 3, "entityTypeId": 174 }`, the path starts with `/v1/items/174`. Use the returned value rather than assuming all type IDs start at 1030.

## Set products of a smart process item

`PUT /v1/items/:entityTypeId/:id/products`

Sets the product rows of a smart process item. Fully replaces the current list — pass every row you need.

## Request fields (body)

| Parameter | Type | Required | Description |
|----------|-----|:-----:|---------|
| `entityTypeId` (path) | number | yes | Smart process type ID |
| `id` (path) | number | yes | Item ID |
| `items` | array | yes | Array of product rows |
| `items[].productId` | number | no | Catalog product ID. Catalog: `GET /v1/products`. Pass `productId` or `productName` — if you pass neither, the row is created with no product and an empty name |
| `items[].productName` | string | no | Row name — for a free-text row with no catalog product |
| `items[].price` | number | no | Unit price. If omitted, the row is created with a zero price |
| `items[].quantity` | number | no | Quantity. If omitted, the row is created with a quantity of `1` |
| `items[].discountTypeId` | number | no | How the discount is set: `1` — as an amount in `discount`, `2` — as a percentage in `discountRate`. Defaults to `2` |
| `items[].discount` | number | no | Discount amount. Applied only when `discountTypeId` is `1` |
| `items[].discountRate` | number | no | Discount percentage. Applied only when `items[].discountTypeId` is `2` |
| `items[].taxRate` | number | no | Tax rate (%) |
| `items[].taxIncluded` | boolean | no | Tax included in the price |

## Examples

### curl — personal key

```bash
curl -X PUT "https://vibecode.bitrix24.com/v1/items/180/47/products" \
  -H "X-Api-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "items": [
      { "productId": 1, "price": 25000, "quantity": 2 },
      { "productId": 5, "price": 5000, "quantity": 1, "discountTypeId": 1, "discount": 500 }
    ]
  }'
```

### curl — OAuth application

```bash
curl -X PUT "https://vibecode.bitrix24.com/v1/items/180/47/products" \
  -H "X-Api-Key: YOUR_APP_KEY" \
  -H "Authorization: Bearer USER_SESSION_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "items": [
      { "productId": 1, "price": 25000, "quantity": 2 },
      { "productId": 5, "price": 5000, "quantity": 1, "discountTypeId": 1, "discount": 500 }
    ]
  }'
```

### JavaScript — personal key

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/items/180/47/products', {
  method: 'PUT',
  headers: {
    'X-Api-Key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    items: [
      { productId: 1, price: 25000, quantity: 2 },
      { productId: 5, price: 5000, quantity: 1, discountTypeId: 1, discount: 500 },
    ],
  }),
})

const { success, data } = await res.json()
```

### JavaScript — OAuth application

```javascript
const res = await fetch('https://vibecode.bitrix24.com/v1/items/180/47/products', {
  method: 'PUT',
  headers: {
    'X-Api-Key': 'YOUR_APP_KEY',
    'Authorization': 'Bearer USER_SESSION_TOKEN',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    items: [
      { productId: 1, price: 25000, quantity: 2 },
      { productId: 5, price: 5000, quantity: 1, discountTypeId: 1, discount: 500 },
    ],
  }),
})

const { success, data } = await res.json()
```

## Response fields

| Field | Type | Description |
|-------|------|-------------|
| `data` | array | Array of the resulting product rows with the fields productId, productName, price, quantity, discount, taxRate, taxIncluded |

Array of the resulting product rows with the fields `productId`, `productName`, `price`, `quantity`, `discount`, `taxRate`, `taxIncluded`.

## Response example

```json
{
  "success": true,
  "data": [
    {
      "productId": 1,
      "productName": "Server equipment",
      "price": 25000,
      "quantity": 2,
      "discount": 0,
      "discountTypeId": 2,
      "taxRate": null,
      "taxIncluded": false
    },
    {
      "productId": 5,
      "productName": "Installation and setup",
      "price": 5000,
      "quantity": 1,
      "discount": 500,
      "discountTypeId": 1,
      "taxRate": null,
      "taxIncluded": false
    }
  ]
}
```

## Error response example

400 — invalid format:

```json
{
  "success": false,
  "error": {
    "code": "INVALID_PARAMS",
    "message": "items must be an array"
  }
}
```

## Errors

| HTTP | Code | Description |
|------|-----|---------|
| 400 | `INVALID_PARAMS` | The body contains a field name that is not among the writable fields — see [Product fields](/docs/entities/items/products-fields) |
| 400 | `INVALID_DYNAMIC_PARAM` | `entityTypeId` is not a positive integer or is reserved (1, 2, 3, 4, 7, 31) |
| 400 | `INVALID_PARAMS` | `items` is not an array or an array element is not a product-row object |
| 400 | `INVALID_PARAMS` | An entry in the `items` array carries no writable product-row field — an empty object, or read-only fields only. The error text lists the writable names |
| 404 | `ENTITY_NOT_FOUND` | Item not found |
| 403 | `SCOPE_DENIED` | The API key does not have the `crm` scope |
| 401 | `TOKEN_MISSING` | The API key has no configured tokens |

Full list of common API errors — [Errors](/docs/errors).

## Known specifics

**Full replacement:** PUT replaces the entire product list. To add a row, first fetch the current ones (`GET`), append the new one to the array, then send everything (`PUT`). Fetch the list in full: without `limit`, [`GET`](./products-get.md) returns only the first page, so pass `limit=5000` or page through with `offset` until `meta.hasMore` is `false`. Sending back an incomplete list erases everything it omits.

## See also

- [Product rows](/docs/entities/items/products-get)
- [Get item](/docs/entities/items/get)
- [CRM products](/docs/entities/products)
- [Limits and optimization](/docs/optimization)