Update line item

PATCH

https://api.light.inc/v1/expenses/{expenseId}/line-items/{lineItemId}

Updates an existing expense line item

Authorization

Send one of these on every request. See Authentication for how to get credentials.

API key
Basic authentication header of the form Basic <api_key>, where <api_key> is your api key.
Bearer token

Path parameters

expenseId string · uuidrequired
lineItemId string · uuidrequired

Request body

application/json;charset=UTF-8

originalAmount integer · int64
billingAmount integer · int64
accountId string · uuid
costCenterId string · uuid
description string
reimbursementCategoryId string · uuid

Response

id string · uuid
expenseId string · uuid
originalAmount integer · int64
billingAmount integer · int64
accountId string · uuid
costCenterId string · uuid
description string
reimbursementCategoryId string · uuid
createdAt string · date-time
updatedAt string · date-time

cURL

curl -X PATCH "https://api.light.inc/v1/expenses/3c90c3cc-0d44-4b50-8888-8dd25736052a/line-items/3c90c3cc-0d44-4b50-8888-8dd25736052a" \
  -H "Authorization: Basic YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "originalAmount": 100000,
  "billingAmount": 100000,
  "accountId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "costCenterId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": "string",
  "reimbursementCategoryId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}'

JavaScript

const res = await fetch("https://api.light.inc/v1/expenses/3c90c3cc-0d44-4b50-8888-8dd25736052a/line-items/3c90c3cc-0d44-4b50-8888-8dd25736052a", {
  method: "PATCH",
  headers: {
    Authorization: `Basic ${process.env.LIGHT_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "originalAmount": 100000,
    "billingAmount": 100000,
    "accountId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "costCenterId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "description": "string",
    "reimbursementCategoryId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }),
});
const data = await res.json();

Python

import os, requests

res = requests.patch(
    "https://api.light.inc/v1/expenses/3c90c3cc-0d44-4b50-8888-8dd25736052a/line-items/3c90c3cc-0d44-4b50-8888-8dd25736052a",
    headers={
        "Authorization": f"Basic {os.environ['LIGHT_API_KEY']}",
    },
    json={
        "originalAmount": 100000,
        "billingAmount": 100000,
        "accountId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "costCenterId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "description": "string",
        "reimbursementCategoryId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    },
)
data = res.json()

Example requestGenerated

{
  "originalAmount": 100000,
  "billingAmount": 100000,
  "accountId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "costCenterId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": "string",
  "reimbursementCategoryId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}

Generated from the schema: shapes and types are real, values are placeholders, and fields that exclude each other are all shown. Do not send it unchanged.

Example responseGenerated

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "expenseId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "originalAmount": 100000,
  "billingAmount": 100000,
  "accountId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "costCenterId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": "string",
  "reimbursementCategoryId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "createdAt": "2026-01-15T09:30:00Z",
  "updatedAt": "2026-01-15T09:30:00Z"
}

Generated from the schema: shapes and types are real, values are placeholders.