# ListCustomersForCertificate

List customers linked to this certificate

`GET /api/v2/companies/{companyId}/certificates/{id}/customers`

**API:** AvaTax API
**Tag:** Certificates
**API Version:** v2
**Base URL:** https://sandbox-rest.avatax.com/
**Accepts:** `application/json`
**Authentication:** API Key (`Authorization` in header) or OAuth 2.0 or Basic (username + license key)

Source: https://developer.avalara.com/products/crossborder/api/methods/Certificates/ListCustomersForCertificate/

## Description

List all customers linked to this certificate.
            
Customers must be linked to a certificate in order to make use of its tax exemption features.  You
can link or unlink customers to a certificate at any time.
            
A certificate is a document stored in either AvaTax Exemptions or CertCapture.  The certificate document
can contain information about a customer's eligibility for exemption from sales or use taxes based on
criteria you specify when you store the certificate.  To view or manage your certificates directly, please
log onto the administrative website for the product you purchased.
            
Before you can use any exemption certificates endpoints, you must set up your company for exemption certificate data storage.
Companies that do not have this storage system set up will see `CertCaptureNotConfiguredError` when they call exemption
certificate related APIs. To check if this is set up for a company, call `GetCertificateSetup`.  To request setup of exemption
certificate storage for this company, call `RequestCertificateSetup`.

### Security Policies

* This API requires one of the following user roles: AccountAdmin, AccountOperator, AccountUser, AvaTaxOnlyAccountAdmin, AvaTaxOnlyAccountUser, AvaTaxOnlyCompanyAdmin, AvaTaxOnlyCompanyUser, BatchServiceAdmin, CompanyAdmin, CompanyUser, CSPTester, SSTAdmin, TechnicalSupportAdmin.
* This API depends on the following active services:*Required* (all):  AvaTaxPro, ECMEssentials, ECMPro, ECMPremium, VEMPro, VEMPremium, ECMProComms, ECMPremiumComms.

## Parameters

| Name | Type | In | Required | Description |
|---|---|---|---|---|
| `companyId` | integer | path | Yes | The unique ID number of the company that recorded this certificate |
| `id` | integer | path | Yes | The unique ID number of this certificate |
| `$include` | string | query | No | OPTIONAL: A comma separated list of special fetch options.
             No options are currently available when fetching customers. |
| `X-Avalara-Client` | string | header | No | Identifies the software you are using to call this API.  For more information on the client header, see [Client Headers](https://developer.avalara.com/avatax/client-headers/) . |

## Responses

| Status | Description | Schema |
|---|---|---|
| 200 | Success | `CustomerModelFetchResult` |
| 400 | Bad Request | `ProblemDetails` |
| 401 | Unauthorized | `ProblemDetails` |
| 404 | Not Found | `ProblemDetails` |

### 200 Response: `CustomerModelFetchResult`

| Property | Type | Required | Description |
|---|---|---|---|
| `@recordsetCount` | integer | No |  |
| `value` | CustomerModel[] | No |  |
| `@nextLink` | string | No |  |
| `pageKey` | string | No |  |

## Example Request

```bash
curl -X GET "https://sandbox-rest.avatax.com/api/v2/companies/{companyId}/certificates/{id}/customers" \
  -H "Authorization: Basic <credentials>" \
  -H "Accept: application/json"
```