curl --request POST \
  --url https://app.sandbox.rio.trade/api/users/{id}/additional-information \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "identifiersArray": [
    "RC511233",
    "SJ556997"
  ],
  "identifiersObject": {
    "RC": "S11233",
    "SJ": "556997"
  },
  "identifiersString": "511233, 556997",
  "identifiersObjectArray": [
    {
      "RC": "S11233",
      "SJ": "556997"
    },
    {
      "RC": "S11233",
      "SJ": "556997"
    }
  ]
}
'

import requests

url = "https://app.sandbox.rio.trade/api/users/{id}/additional-information"

payload = {
    "identifiersArray": ["RC511233", "SJ556997"],
    "identifiersObject": {
        "RC": "S11233",
        "SJ": "556997"
    },
    "identifiersString": "511233, 556997",
    "identifiersObjectArray": [
        {
            "RC": "S11233",
            "SJ": "556997"
        },
        {
            "RC": "S11233",
            "SJ": "556997"
        }
    ]
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    identifiersArray: ['RC511233', 'SJ556997'],
    identifiersObject: {RC: 'S11233', SJ: '556997'},
    identifiersString: '511233, 556997',
    identifiersObjectArray: [{RC: 'S11233', SJ: '556997'}, {RC: 'S11233', SJ: '556997'}]
  })
};

fetch('https://app.sandbox.rio.trade/api/users/{id}/additional-information', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.sandbox.rio.trade/api/users/{id}/additional-information",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'identifiersArray' => [
        'RC511233',
        'SJ556997'
    ],
    'identifiersObject' => [
        'RC' => 'S11233',
        'SJ' => '556997'
    ],
    'identifiersString' => '511233, 556997',
    'identifiersObjectArray' => [
        [
                'RC' => 'S11233',
                'SJ' => '556997'
        ],
        [
                'RC' => 'S11233',
                'SJ' => '556997'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://app.sandbox.rio.trade/api/users/{id}/additional-information"

	payload := strings.NewReader("{\n  \"identifiersArray\": [\n    \"RC511233\",\n    \"SJ556997\"\n  ],\n  \"identifiersObject\": {\n    \"RC\": \"S11233\",\n    \"SJ\": \"556997\"\n  },\n  \"identifiersString\": \"511233, 556997\",\n  \"identifiersObjectArray\": [\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    },\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    }\n  ]\n}")

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

	req.Header.Add("x-api-key", "<api-key>")
	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))

}

HttpResponse<String> response = Unirest.post("https://app.sandbox.rio.trade/api/users/{id}/additional-information")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"identifiersArray\": [\n    \"RC511233\",\n    \"SJ556997\"\n  ],\n  \"identifiersObject\": {\n    \"RC\": \"S11233\",\n    \"SJ\": \"556997\"\n  },\n  \"identifiersString\": \"511233, 556997\",\n  \"identifiersObjectArray\": [\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    },\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.sandbox.rio.trade/api/users/{id}/additional-information")

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

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"identifiersArray\": [\n    \"RC511233\",\n    \"SJ556997\"\n  ],\n  \"identifiersObject\": {\n    \"RC\": \"S11233\",\n    \"SJ\": \"556997\"\n  },\n  \"identifiersString\": \"511233, 556997\",\n  \"identifiersObjectArray\": [\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    },\n    {\n      \"RC\": \"S11233\",\n      \"SJ\": \"556997\"\n    }\n  ]\n}"

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

OK

{
  "errors": [
    {
      "code": 19,
      "message": "Not authorized"
    }
  ]
}

{
  "errors": [
    {
      "code": 1,
      "message": "User not found"
    }
  ]
}