> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cryptomate.me/llms.txt
> Use this file to discover all available pages before exploring further.

# Update provider customer link

> Update the external customer ID for an existing provider link.

<Warning>
  **Deprecated.** This endpoint is no longer available in the public API and is kept for reference only.
</Warning>

Updates the customer ID for an existing provider customer link. Requires an API key with access level 3 or higher.

## Path parameters

<ParamField path="clientId" type="string" required>
  Unique identifier of the client.
</ParamField>

<ParamField path="id" type="string" required>
  Unique identifier of the provider customer link.
</ParamField>

## Body

<ParamField body="customer_id" type="string" required>
  Updated customer ID in the external provider's system.
</ParamField>

## Response

See [Create provider customer link](/api-reference/management/clients/create-provider-customer) for the field list.

<RequestExample>
  ```bash cURL theme={null}
  curl -X PUT "https://api.cryptomate.me/management/clients/client_a1b2c3d4-e5f6-4a7b-8c9d-0e1f2a3b4c5d/providers/cpc_abc123" \
    -H "x-api-key: $CRYPTOMATE_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "customer_id": "cust_ext_updated_123"
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json 404 Not Found theme={null}
  {
    "code": "NOT_FOUND",
    "message": "ClientProviderCustomer not found"
  }
  ```
</ResponseExample>