---
title: "Update a customer contact · Customers · COUNT Partner API"
description: "Updates one contact on a customer. PUT /partners/customers/{uuid}/contacts/{contactUuid}"
canonical: "https://developers.getcount.com/reference/customers/update-customer-contact"
source: "https://developers.getcount.com/reference/customers/update-customer-contact"
---
[Customers](https://developers.getcount.com/reference/customers) / Update a customer contact

# Update a customer contact

PUT `/partners/customers/{uuid}/contacts/{contactUuid}`

Updates one contact on a customer.

A partial update — send only the fields you want to change, but send at least one. The same field allowlist as Add a customer contact applies.

HMAC signature + Bearer access token

[Try this request](https://developers.getcount.com/tools/try-it?method=PUT&path=%2Fpartners%2Fcustomers%2F%7Buuid%7D%2Fcontacts%2F%7BcontactUuid%7D&body=%7B%0A++%22email%22%3A+%22john.doe%40acme.com%22%2C%0A++%22isPrimary%22%3A+true%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)

#### Path parameters

`uuid` uuid required

The customer UUID.

`contactUuid` uuid required

The contact UUID, as returned under `id` on a contact.

#### Request body

`firstName` string

Contact's first name. Must be a non-empty string if sent.

`lastName` string

Contact's last name.

`email` string

Contact's email address.

`phone` string

Contact's phone number.

`isPrimary` boolean

Marks this contact as the primary one.

#### Responses

`200` The updated contact, returned under `updatedContact`.

`400` Empty body, or a field has the wrong type.

`404` Customer or contact 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 a customer contact](https://developers.getcount.com/reference/customers/add-customer-contact) [Next DELETE Delete a customer contact](https://developers.getcount.com/reference/customers/delete-customer-contact)

PUT `https://api.getcount.com/partners/customers/{uuid}/contacts/{contactUuid}`

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 = 'PUT';
const signingPath = '/customers/3fa85f64-5717-4562-b3fc-2c963f66afa6/contacts/3fa85f64-5717-4562-b3fc-2c963f66afa6';
const timestamp = Math.floor(Date.now() / 1000).toString();
const body = {
  "email": "john.doe@acme.com",
  "isPrimary": true
};
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/3fa85f64-5717-4562-b3fc-2c963f66afa6/contacts/3fa85f64-5717-4562-b3fc-2c963f66afa6`, {
  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": "Success on updating contact John",
  "data": {
    "updatedContact": {
      "id": "a5da3577-bf85-4e3a-aa73-df85ca69bc67",
      "firstName": "John",
      "lastName": "Doe",
      "email": "john.doe@acme.com",
      "phone": "+1234567890",
      "isPrimary": true,
      "createdAt": "2026-01-15T10:30:00.000Z",
      "updatedAt": "2026-01-28T14:22:30.000Z"
    }
  }
}
```