---
title: "Apply vendor memos to a bill · Bills · COUNT Partner API"
description: "Applies one or more vendor credit memos toward an approved bill. POST /partners/bills/{uuid}/apply-vendor-memos"
canonical: "https://developers.getcount.com/reference/bills/apply-vendor-memos-to-bill"
source: "https://developers.getcount.com/reference/bills/apply-vendor-memos-to-bill"
---
[Bills](https://developers.getcount.com/reference/bills) / Apply vendor memos to a bill

# Apply vendor memos to a bill

POST `/partners/bills/{uuid}/apply-vendor-memos`

Applies one or more vendor credit memos toward an approved bill.

Target bill must be approved with amountDue > 0. Each memo id is a vendor_memo UUID from list bills with billType=vendor_memo. Memos must belong to the same vendor.

HMAC signature + Bearer access token

[Try this request](https://developers.getcount.com/tools/try-it?method=POST&path=%2Fpartners%2Fbills%2F%7Buuid%7D%2Fapply-vendor-memos&body=%7B%0A++%22memosBills%22%3A+%5B%0A++++%7B%0A++++++%22id%22%3A+%22e3f4a5b6-c7d8-9012-efab-345678901234%22%2C%0A++++++%22amount%22%3A+100%0A++++%7D%0A++%5D%0A%7D)

[Transactions API](https://developers.getcount.com/reference/transactions) [Vendors API](https://developers.getcount.com/reference/vendors) [Chart of Accounts API](https://developers.getcount.com/reference/chart-of-accounts)

#### Path parameters

`uuid` uuid required

The target bill UUID.

#### Request body

`memosBills` array required

Vendor memos to apply.

`id` uuid required

Vendor memo bill UUID.

`amount` number required

Portion of memo balance to apply. Must be > 0.

#### Responses

`200` Vendor memos applied.

`400` Bill not approved, insufficient memo balance, or vendor mismatch.

`404` Bill or vendor memo not found.

`401` Missing or invalid HMAC signature, expired timestamp, or invalid Bearer token. [Troubleshoot](https://developers.getcount.com/getting-started/errors#error-401)

`403` The credential does not have access to this workspace or resource. [Troubleshoot](https://developers.getcount.com/getting-started/errors#error-403)

`429` Rate limit exceeded (100 requests per minute per clientId). Retry after the Retry-After header. [Troubleshoot](https://developers.getcount.com/getting-started/errors#error-429)

[Previous POST Approve a bill](https://developers.getcount.com/reference/bills/approve-bill) [Next POST Assign transactions as payment](https://developers.getcount.com/reference/bills/assign-bill-transaction)

POST `https://api.getcount.com/partners/bills/{uuid}/apply-vendor-memos`

Request

```javascript
import crypto from 'node:crypto';

const BASE_URL = 'https://api.getcount.com';
const CLIENT_ID = process.env.COUNT_CLIENT_ID;
const CLIENT_SECRET = process.env.COUNT_CLIENT_SECRET;
const ACCESS_TOKEN = process.env.COUNT_ACCESS_TOKEN;

const method = 'POST';
const signingPath = '/bills/3fa85f64-5717-4562-b3fc-2c963f66afa6/apply-vendor-memos';
const timestamp = Math.floor(Date.now() / 1000).toString();
const body = {
  "memosBills": [
    {
      "id": "e3f4a5b6-c7d8-9012-efab-345678901234",
      "amount": 100
    }
  ]
};
const bodyString = JSON.stringify(body);

const bodyHash = crypto.createHash('sha256').update(bodyString).digest('hex');
const baseString = `${method}:${signingPath}:${timestamp}:${bodyHash}`;
const signature = crypto.createHmac('sha256', CLIENT_SECRET).update(baseString).digest('hex');

const response = await fetch(`${BASE_URL}/partners/bills/3fa85f64-5717-4562-b3fc-2c963f66afa6/apply-vendor-memos`, {
  method,
  headers: {
    'x-client-id': CLIENT_ID,
    'x-timestamp': timestamp,
    'x-signature': signature,
    'Content-Type': 'application/json',
    Authorization: `Bearer ${ACCESS_TOKEN}`,
  },
  body: bodyString,
});

console.log(await response.json());
```

Response · 200

```json
{
  "status": "success",
  "message": "Vendor memos applied to bill",
  "data": {
    "paidbill": {
      "id": "b2c3d4e5-f6a7-8901-bcde-f23456789012",
      "billNumber": "BILL-1042",
      "billType": "bill",
      "date": "2026-01-15",
      "dueDate": "2026-02-15",
      "currency": "USD",
      "approvalStatus": "approved",
      "status": "unpaid",
      "total": 250,
      "paidAmount": 100,
      "amountDue": 150,
      "notes": "Office supplies for Q1",
      "purchaseOrderNumber": null,
      "isDeleted": false,
      "vendor": {
        "id": "f1a2b3c4-d5e6-7890-abcd-ef1234567890",
        "name": "Office Depot",
        "email": "ap@officedepot.example"
      },
      "lineItems": [
        {
          "id": "a4b5c6d7-e8f9-0123-abcd-456789012345",
          "description": "Office supplies",
          "quantity": 1,
          "price": 250,
          "total": 250,
          "categoryAccountUuid": "c3d4e5f6-a7b8-9012-cdef-123456789012"
        }
      ],
      "transactions": [],
      "appliedVendorMemos": [
        {
          "id": "e3f4a5b6-c7d8-9012-efab-345678901234",
          "amount": 100
        }
      ],
      "tagUuids": [],
      "createdAt": "2026-01-15T10:30:00.000Z",
      "updatedAt": "2026-01-28T14:22:30.000Z"
    }
  }
}
```