---
title: "Bulk create customers · Customers · COUNT Partner API"
description: "Creates up to 100 customers in one request with partial-success semantics. POST /partners/customers/bulk"
canonical: "https://developers.getcount.com/reference/customers/bulk-create-customers"
source: "https://developers.getcount.com/reference/customers/bulk-create-customers"
---
[Customers](https://developers.getcount.com/reference/customers) / Bulk create customers

# Bulk create customers

POST `/partners/customers/bulk`

Creates up to 100 customers in one request with partial-success semantics.

Each row uses the same shape as Add a customer. Rows are processed independently — one failure does not roll back others. Returns the bulk batch shape documented in Response shapes (HTTP 201). Recommended batch size ~25 for large migrations.

HMAC signature + Bearer access token

[Try this request](https://developers.getcount.com/tools/try-it?method=POST&path=%2Fpartners%2Fcustomers%2Fbulk&body=%7B%0A++%22customers%22%3A+%5B%0A++++%7B%0A++++++%22customer%22%3A+%22Acme+Corporation%22%2C%0A++++++%22email%22%3A+%22billing%40acme.com%22%0A++++%7D%2C%0A++++%7B%0A++++++%22customer%22%3A+%22Beta+LLC%22%2C%0A++++++%22mainPhone%22%3A+%22%2B1234567890%22%0A++++%7D%0A++%5D%0A%7D)

[Invoices API](https://developers.getcount.com/reference/invoices) [Projects API](https://developers.getcount.com/reference/projects) [Recurring Invoice Templates API](https://developers.getcount.com/reference/recurring-invoice-templates)

#### Request body

`customers` array required

Array of customer create payloads (same fields as POST /partners/customers).

#### Responses

`201` Batch accepted. Check successCount and per-row results.

`400` Batch-level validation failed (empty array, over 100 rows, etc.).

`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 PUT Update a customer](https://developers.getcount.com/reference/customers/update-customer) [Next PATCH Bulk update customers](https://developers.getcount.com/reference/customers/bulk-update-customers)

POST `https://api.getcount.com/partners/customers/bulk`

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 = '/customers/bulk';
const timestamp = Math.floor(Date.now() / 1000).toString();
const body = {
  "customers": [
    {
      "customer": "Acme Corporation",
      "email": "billing@acme.com"
    },
    {
      "customer": "Beta LLC",
      "mainPhone": "+1234567890"
    }
  ]
};
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/customers/bulk`, {
  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 · 201

```json
{
  "successCount": 2,
  "errorCount": 0,
  "results": [
    {
      "index": 0,
      "success": true,
      "customer": {
        "id": "dfa3219e-6af8-4c53-997a-037534f63a35",
        "customer": "Acme Corporation",
        "email": "contact@acme.com",
        "mainPhone": "+1234567890",
        "website": "https://acme.com",
        "status": "active",
        "notes": "Preferred customer. Net-30 terms.",
        "paymentTerm": "net30",
        "taxNumber": null,
        "taxAutoCalculate": false,
        "taxExcluded": false,
        "contactName": "John Doe",
        "billingAddress": {
          "id": "0b2c1f5e-7a9d-4f2b-9c1e-2a4b6d8e0f12",
          "street": "123 Main St",
          "city": "San Francisco",
          "state": "CA",
          "zipCode": "94102",
          "country": "USA"
        },
        "shippingAddress": null,
        "contacts": [
          {
            "id": "a5da3577-bf85-4e3a-aa73-df85ca69bc67",
            "firstName": "John",
            "lastName": "Doe",
            "email": "john@acme.com",
            "phone": "+1234567890",
            "isPrimary": true
          }
        ],
        "taxes": [],
        "salesRep": null,
        "createdAt": "2026-01-15T10:30:00.000Z",
        "updatedAt": "2026-01-28T14:22:30.000Z"
      }
    }
  ]
}
```