---
title: "Upload attachment · Invoices · COUNT Partner API"
description: "Uploads a file attachment via multipart form data. POST /partners/invoices/{uuid}/attachments/upload"
canonical: "https://developers.getcount.com/reference/invoices/upload-invoice-attachment"
source: "https://developers.getcount.com/reference/invoices/upload-invoice-attachment"
---
[Invoices](https://developers.getcount.com/reference/invoices) / Upload attachment

# Upload attachment

POST `/partners/invoices/{uuid}/attachments/upload`

Uploads a file attachment via multipart form data.

Send multipart/form-data with a `documents` field. Sign the request with an empty-object body hash.

HMAC signature + Bearer access token

[Try this request](https://developers.getcount.com/tools/try-it?method=POST&path=%2Fpartners%2Finvoices%2F%7Buuid%7D%2Fattachments%2Fupload)

[Credit Memos API](https://developers.getcount.com/reference/credit-memo) [Customers API](https://developers.getcount.com/reference/customers) [Products & Services API](https://developers.getcount.com/reference/products-and-services) [Transactions API](https://developers.getcount.com/reference/transactions)

#### Path parameters

`uuid` uuid required

The UUID of the invoice.

#### Responses

`200` Attachment uploaded.

`400` Missing file or validation error.

`404` Invoice 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 Add attachments from URLs](https://developers.getcount.com/reference/invoices/add-invoice-attachments) [Next PATCH Apply multiple credits to invoice](https://developers.getcount.com/reference/invoices/apply-multiple-credit-to-invoice)

POST `https://api.getcount.com/partners/invoices/{uuid}/attachments/upload`

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 = '/invoices/3fa85f64-5717-4562-b3fc-2c963f66afa6/attachments/upload';
const timestamp = Math.floor(Date.now() / 1000).toString();
const bodyString = '';

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

const response = await fetch(`${BASE_URL}/partners/invoices/3fa85f64-5717-4562-b3fc-2c963f66afa6/attachments/upload`, {
  method,
  headers: {
    'x-client-id': CLIENT_ID,
    'x-timestamp': timestamp,
    'x-signature': signature,
    Authorization: `Bearer ${ACCESS_TOKEN}`,
  },
});

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

Response · 200

```json
{
  "status": "success",
  "data": {
    "invoice": {
      "id": "f6a7b8c9-d0e1-2345-fabc-456789012345",
      "invoiceNumber": "INV-1042",
      "invoiceType": "invoice",
      "customerUuid": "dfa3219e-6af8-4c53-997a-037534f63a35",
      "date": "2026-03-01",
      "dueDate": "2026-03-31",
      "currency": "USD",
      "status": "sent",
      "isDraft": false,
      "approved": true,
      "isSent": true,
      "paymentStatus": "unpaid",
      "subtotal": 1000,
      "taxTotal": 85,
      "total": 1085,
      "amountDue": 1085,
      "products": [
        {
          "productUuid": "aa11bb22-cc33-dd44-ee55-ff6677889900",
          "description": "Consulting services",
          "quantity": 10,
          "unitPrice": 100,
          "nonTaxable": false
        }
      ],
      "createdAt": "2026-03-01T09:00:00.000Z",
      "updatedAt": "2026-03-02T11:15:00.000Z"
    }
  }
}
```