const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({name: 'Jo Brown-Anderson'})
};

fetch('https://api.paddle.com/customers/{customer_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "data": {
    "id": "ctm_01hv6y1jedq4p1n0yqn5ba3ky4",
    "status": "active",
    "custom_data": null,
    "name": "Jo Brown-Anderson",
    "email": "[email protected]",
    "marketing_consent": false,
    "locale": "en",
    "created_at": "2024-04-11T15:57:24.813Z",
    "updated_at": "2024-04-11T15:59:56.658719Z",
    "import_meta": null
  },
  "meta": {
    "request_id": "bfa19139-37cc-48ef-8e75-215587e71ab2"
  }
}