curl --request PUT \
  --url https://api.opencard.io/api/v1/application/accounts/{accountId}/organizations/{organizationId}/cardholders/{cardHolderId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reference_id": "employee_john_99"
}
'

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({reference_id: 'employee_john_99'})
};

fetch('https://api.opencard.io/api/v1/application/accounts/{accountId}/organizations/{organizationId}/cardholders/{cardHolderId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.opencard.io/api/v1/application/accounts/{accountId}/organizations/{organizationId}/cardholders/{cardHolderId}"

payload = { "reference_id": "employee_john_99" }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.opencard.io/api/v1/application/accounts/{accountId}/organizations/{organizationId}/cardholders/{cardHolderId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'reference_id' => 'employee_john_99'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

{
  "id": 15,
  "reference_id": "employee_john_42",
  "organization_id": 3,
  "identity_id": 123,
  "email": "john@acme.se",
  "created_at": "2026-06-08T10:00:00.000000Z",
  "updated_at": "2026-06-08T10:30:00.000000Z",
  "meta": {
    "ssn": true,
    "signed": true,
    "signed_at": "2026-06-08T10:30:00.000000Z",
    "email_status": "delivered",
    "pdpc_url": "https://sandbox-api.opencard.io/accounts/1/pdpcs/8/sign/abc...",
    "system": "Acme EMS",
    "organization_number": "5561234567"
  },
  "identity": {
    "name": "Anna Andersson",
    "employee_id": "001"
  }
}

{
  "error": "Card holder reference employee_john_42 already exists"
}