curl --request PATCH \
  --url https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/fields \
  --header 'Content-Type: application/json' \
  --data '
{
  "fields": [
    {
      "eventId": "123-abc",
      "systemEvent": "OT_STANDARD_50_PERCENT",
      "advancedPercentage": 0.5
    }
  ]
}
'

const options = {
  method: 'PATCH',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    fields: [
      {
        eventId: '123-abc',
        systemEvent: 'OT_STANDARD_50_PERCENT',
        advancedPercentage: 0.5
      }
    ]
  })
};

fetch('https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/fields', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/fields"

payload = { "fields": [
        {
            "eventId": "123-abc",
            "systemEvent": "OT_STANDARD_50_PERCENT",
            "advancedPercentage": 0.5
        }
    ] }
headers = {"Content-Type": "application/json"}

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

print(response.text)

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/fields"

	payload := strings.NewReader("{\n  \"fields\": [\n    {\n      \"eventId\": \"123-abc\",\n      \"systemEvent\": \"OT_STANDARD_50_PERCENT\",\n      \"advancedPercentage\": 0.5\n    }\n  ]\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/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([
    'fields' => [
        [
                'eventId' => '123-abc',
                'systemEvent' => 'OT_STANDARD_50_PERCENT',
                'advancedPercentage' => 0.5
        ]
    ]
  ]),
  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;
}

require 'uri'
require 'net/http'

url = URI("https://api.example.com/payment-sheet/parameter/{paymentSheetParameterId}/fields")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"fields\": [\n    {\n      \"eventId\": \"123-abc\",\n      \"systemEvent\": \"OT_STANDARD_50_PERCENT\",\n      \"advancedPercentage\": 0.5\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "status": true,
  "mensagem": "OK"
}

{
  "service": "<string>",
  "method": "<string>",
  "message": "message erro"
}