curl --request PATCH \
  --url https://app.mindo.ar/api/v1/cases/{id}/fields \
  --header 'Content-Type: application/json' \
  --data '
{
  "attrs": {
    "producto": "Sillón de 3 cuerpos",
    "cantidad": "2"
  },
  "amount": 850000
}
'

const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({attrs: {producto: 'Sillón de 3 cuerpos', cantidad: '2'}, amount: 850000})
};

fetch('https://app.mindo.ar/api/v1/cases/{id}/fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://app.mindo.ar/api/v1/cases/{id}/fields"

payload = {
    "attrs": {
        "producto": "Sillón de 3 cuerpos",
        "cantidad": "2"
    },
    "amount": 850000
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.mindo.ar/api/v1/cases/{id}/fields",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'attrs' => [
        'producto' => 'Sillón de 3 cuerpos',
        'cantidad' => '2'
    ],
    'amount' => 850000
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

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

curl_close($curl);

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