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Credit MemosApply credit to multiple invoices

Apply credit to multiple invoices

PATCH/partners/invoices/{uuid}/apply-credit-to-multiple-invoices

Applies a credit memo to one or more target invoices.

Path is the credit memo UUID. Each invoices[].id is a target invoice UUID.

HMAC signature + Bearer access token
Try this request
Invoices API

Path parameters

uuiduuidrequired

The credit memo UUID.

Request body

invoicesarrayrequired

Invoices to apply credit against.

iduuidrequired

Target invoice UUID.

amountnumberrequired

Amount of credit to apply.

Responses

200Credit applied to invoices.
400Invalid credit amount or invoice state.
404Credit memo or invoice not found.
401Missing or invalid HMAC signature, expired timestamp, or invalid Bearer token. Troubleshoot
403The credential does not have access to this workspace or resource. Troubleshoot
429Rate limit exceeded (100 requests per minute per clientId). Retry after the Retry-After header. Troubleshoot
PATCHhttps://api.getcount.com/partners/invoices/{uuid}/apply-credit-to-multiple-invoices
Request
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 = 'PATCH';
const signingPath = '/invoices/3fa85f64-5717-4562-b3fc-2c963f66afa6/apply-credit-to-multiple-invoices';
const timestamp = Math.floor(Date.now() / 1000).toString();
const body = {
  "invoices": [
    {
      "id": "f6a7b8c9-d0e1-2345-fabc-456789012345",
      "amount": 500
    }
  ]
};
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/invoices/3fa85f64-5717-4562-b3fc-2c963f66afa6/apply-credit-to-multiple-invoices`, {
  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
{
  "status": "success",
  "data": {
    "invoice": {
      "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
      "invoiceNumber": "CM-0042",
      "invoiceType": "memo",
      "customerUuid": "dfa3219e-6af8-4c53-997a-037534f63a35",
      "appliedToInvoiceUuid": "f6a7b8c9-d0e1-2345-fabc-456789012345",
      "date": "2026-03-01",
      "dueDate": null,
      "currency": "USD",
      "status": "approved",
      "isDraft": false,
      "approved": true,
      "isSent": false,
      "paymentStatus": "paid",
      "subtotal": 500,
      "taxTotal": 0,
      "total": 500,
      "amountDue": 0,
      "products": [
        {
          "productUuid": "aa11bb22-cc33-dd44-ee55-ff6677889900",
          "description": "Credit for overbilling on prior invoice",
          "quantity": 1,
          "unitPrice": 500,
          "nonTaxable": true
        }
      ],
      "createdAt": "2026-03-01T09:00:00.000Z",
      "updatedAt": "2026-03-02T11:15:00.000Z"
    }
  }
}