curl --request PUT \
  --url https://public-api.etoro.com/api/v1/users/personaldetails \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-request-id: <x-request-id>' \
  --header 'x-user-key: <api-key>' \
  --data '
{
  "firstName": "John",
  "lastName": "Doe",
  "dateOfBirth": "1990-01-01",
  "citizenshipCountry": "DE",
  "taxIds": [
    {
      "taxId": "IL311111118",
      "country": "IL",
      "primary": false
    },
    {
      "taxId": "44892353279",
      "country": "DE",
      "primary": true
    }
  ]
}
'

import requests

url = "https://public-api.etoro.com/api/v1/users/personaldetails"

payload = {
    "firstName": "John",
    "lastName": "Doe",
    "dateOfBirth": "1990-01-01",
    "citizenshipCountry": "DE",
    "taxIds": [
        {
            "taxId": "IL311111118",
            "country": "IL",
            "primary": False
        },
        {
            "taxId": "44892353279",
            "country": "DE",
            "primary": True
        }
    ]
}
headers = {
    "x-request-id": "<x-request-id>",
    "x-api-key": "<api-key>",
    "x-user-key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {
    'x-request-id': '<x-request-id>',
    'x-api-key': '<api-key>',
    'x-user-key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    firstName: 'John',
    lastName: 'Doe',
    dateOfBirth: '1990-01-01',
    citizenshipCountry: 'DE',
    taxIds: [
      {taxId: 'IL311111118', country: 'IL', primary: false},
      {taxId: '44892353279', country: 'DE', primary: true}
    ]
  })
};

fetch('https://public-api.etoro.com/api/v1/users/personaldetails', 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://public-api.etoro.com/api/v1/users/personaldetails",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'firstName' => 'John',
    'lastName' => 'Doe',
    'dateOfBirth' => '1990-01-01',
    'citizenshipCountry' => 'DE',
    'taxIds' => [
        [
                'taxId' => 'IL311111118',
                'country' => 'IL',
                'primary' => false
        ],
        [
                'taxId' => '44892353279',
                'country' => 'DE',
                'primary' => true
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>",
    "x-request-id: <x-request-id>",
    "x-user-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://public-api.etoro.com/api/v1/users/personaldetails"

	payload := strings.NewReader("{\n  \"firstName\": \"John\",\n  \"lastName\": \"Doe\",\n  \"dateOfBirth\": \"1990-01-01\",\n  \"citizenshipCountry\": \"DE\",\n  \"taxIds\": [\n    {\n      \"taxId\": \"IL311111118\",\n      \"country\": \"IL\",\n      \"primary\": false\n    },\n    {\n      \"taxId\": \"44892353279\",\n      \"country\": \"DE\",\n      \"primary\": true\n    }\n  ]\n}")

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

	req.Header.Add("x-request-id", "<x-request-id>")
	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("x-user-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.put("https://public-api.etoro.com/api/v1/users/personaldetails")
  .header("x-request-id", "<x-request-id>")
  .header("x-api-key", "<api-key>")
  .header("x-user-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"firstName\": \"John\",\n  \"lastName\": \"Doe\",\n  \"dateOfBirth\": \"1990-01-01\",\n  \"citizenshipCountry\": \"DE\",\n  \"taxIds\": [\n    {\n      \"taxId\": \"IL311111118\",\n      \"country\": \"IL\",\n      \"primary\": false\n    },\n    {\n      \"taxId\": \"44892353279\",\n      \"country\": \"DE\",\n      \"primary\": true\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://public-api.etoro.com/api/v1/users/personaldetails")

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

request = Net::HTTP::Put.new(url)
request["x-request-id"] = '<x-request-id>'
request["x-api-key"] = '<api-key>'
request["x-user-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"firstName\": \"John\",\n  \"lastName\": \"Doe\",\n  \"dateOfBirth\": \"1990-01-01\",\n  \"citizenshipCountry\": \"DE\",\n  \"taxIds\": [\n    {\n      \"taxId\": \"IL311111118\",\n      \"country\": \"IL\",\n      \"primary\": false\n    },\n    {\n      \"taxId\": \"44892353279\",\n      \"country\": \"DE\",\n      \"primary\": true\n    }\n  ]\n}"

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