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

fetch('http://{defaultHost}/api/v2/platform/orders/{id}/apply_coupon_code', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

curl --request PATCH \
  --url http://{defaultHost}/api/v2/platform/orders/{id}/apply_coupon_code \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "coupon_code": "<string>"
}
'

{
  "error": "The access token is invalid"
}

{
  "error": "The resource you were looking for could not be found."
}