curl --request POST \
  --url https://seu-dominio.com/v2/pix/refund \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "pix_id": "<string>",
  "amount": 123,
  "description": "<string>"
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({pix_id: '<string>', amount: 123, description: '<string>'})
};

fetch('https://seu-dominio.com/v2/pix/refund', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://seu-dominio.com/v2/pix/refund"

payload = {
    "pix_id": "<string>",
    "amount": 123,
    "description": "<string>"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{}