---
title: "Update Item Quantity"
description: "Modify item quantities for customers, supporting both increases and decreases with configurable constraints."
api: "POST /payments/items/{customer_type}/{customer_id}/{item_id}/update-quantity"
---

## Request

### Path Parameters

<ParamField path="customer_type" type="string" required>
  The type of customer.
</ParamField>

<ParamField path="customer_id" type="string" required>
  The ID of the customer.
</ParamField>

<ParamField path="item_id" type="string" required>
  The ID of the item to update.
</ParamField>

### Query Parameters

<ParamField query="allow_negative" type="boolean">
  Whether to allow the quantity to go negative.
</ParamField>

### Body Parameters

<ParamField body="body" type="object" required>
  Request body required.
</ParamField>

## Response

<ResponseField name="200" type="object">
  Successful response.
</ResponseField>