# Update a product price

Sets the price and the price before discount. Requires If-Match.

```http
PATCH https://larm.sa/stores/{storeId}/v1/products/{id}/prices
```

Scope: `products.prices:write`

A change of more than 90% up or down is rejected with `PRICE_CHANGE_TOO_LARGE`, to protect the merchant from an app error.

## Path parameters

| Field | Type | Required | Description |
|---|---|---|---|
| `id` | string | yes |  |


## Headers

| Field | Type | Required | Description |
|---|---|---|---|
| `If-Match` | string | yes |  |


## Request body

| Field | Type | Required | Description |
|---|---|---|---|
| `price` | string | yes |  |
| `old_price` | string \| null | no |  |


## Response

| Field | Type | Required | Description |
|---|---|---|---|
| `data` | object | yes |  |
| `data.id` | integer | no |  |
| `data.resource_version` | integer | no |  |
| `data.price` | string | no | Price in SAR. |
| `data.old_price` | string \| null | no | Price before discount. |
| `data.price_state` | object | no | required until a price is set; a new product is created inactive with price 0.00. One of: `required`, `ready`. |
| `execution` | object | no | Who executed the request: the app, version, installation and store. Field names here are camelCase. |
| `execution.appId` | string (uuid) | no |  |
| `execution.versionId` | string (uuid) | no |  |
| `execution.installationId` | string (uuid) | no |  |
| `execution.storeId` | string (uuid) | no |  |
| `execution.requestId` | string (uuid) | no |  |
| `execution.generation` | integer | no |  |
| `execution.routeEpoch` | integer | no |  |
| `execution.appAuthEpoch` | integer | no |  |
| `execution.grantRevision` | integer | no |  |
| `meta` | object | yes |  |
| `meta.request_id` | string (uuid) | no | The request ID; include it in any support request. |


## Example request

```bash
curl -X PATCH "https://larm.sa/stores/$STORE_ID/v1/products/311/prices" \
  -H "Authorization: Bearer $ACCESS_TOKEN" \
  -H "If-Match: $ETAG" \
  -H "Content-Type: application/json" \
  -d '{ "price": "95.00", "old_price": "110.00" }'
```


## Example response (200)

```json
{
  "data": {
    "id": 311,
    "resource_version": 8,
    "price": "95.00",
    "old_price": "110.00",
    "price_state": "ready"
  },
  "execution": {
    "appId": "1f2e3d4c-5b6a-4978-8695-a4b3c2d1e0f9",
    "versionId": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
    "installationId": "c7e4a1f2-6b3d-4e8a-9c05-1d2f3a4b5c6d",
    "storeId": "5b1d7a62-0c4e-4f38-9a51-2e7b3c9d8f10",
    "requestId": "3f0c2b8e-7a51-4c1e-9d0a-5b6f1e2d4c3a",
    "generation": 1,
    "routeEpoch": 4,
    "appAuthEpoch": 1,
    "grantRevision": 2
  },
  "meta": {
    "request_id": "3f0c2b8e-7a51-4c1e-9d0a-5b6f1e2d4c3a"
  }
}
```


## Errors

| HTTP | Code | Meaning |
|---|---|---|
| 428 | `PRECONDITION_REQUIRED` | No If-Match header. |
| 412 | `RESOURCE_CHANGED` | The resource changed after you read it; read it again. |
| 422 | `PRICE_CHANGE_TOO_LARGE` | Change larger than 90%. |