curl -X GET "https://api.fitsociety.io/public/v1/clients/{clientId}/custom-fields" \
  -H "Authorization: Bearer <access_token>"

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.fitsociety.io/public/v1/clients/{clientId}/custom-fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.fitsociety.io/public/v1/clients/{clientId}/custom-fields"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

{
  "data": {
    "clientId": "<string>",
    "customFields": [
      {
        "key": "<string>",
        "label": {
          "en": "<string>",
          "nl": "<string>"
        },
        "type": "<string>",
        "value": "<string>",
        "updatedAt": "2023-11-07T05:31:56Z"
      }
    ]
  },
  "meta": {
    "requestId": "4f849d7d-f4f1-45cc-b4b7-3984a3d17f83",
    "rateLimit": {
      "limit": 10,
      "remaining": 9,
      "resetSeconds": 1,
      "retryAfterSeconds": 1
    }
  }
}