curl --request POST \
  --url https://{tenant}/api/users \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "active": true,
  "email_address": "itachi@gmail.com",
  "first_name": "itachi",
  "last_name": "sasuke",
  "user_permissions": {
    "analytics": "read",
    "api_assets": "write",
    "apis": "write",
    "certs": "write",
    "hooks": "write",
    "idm": "write",
    "keys": "write",
    "log": "read",
    "oauth": "write",
    "policies": "write",
    "portal": "write",
    "system": "write",
    "user_groups": "write",
    "users": "write",
    "websockets": "read"
  }
}
'

import requests

url = "https://{tenant}/api/users"

payload = {
    "active": True,
    "email_address": "itachi@gmail.com",
    "first_name": "itachi",
    "last_name": "sasuke",
    "user_permissions": {
        "analytics": "read",
        "api_assets": "write",
        "apis": "write",
        "certs": "write",
        "hooks": "write",
        "idm": "write",
        "keys": "write",
        "log": "read",
        "oauth": "write",
        "policies": "write",
        "portal": "write",
        "system": "write",
        "user_groups": "write",
        "users": "write",
        "websockets": "read"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    active: true,
    email_address: 'itachi@gmail.com',
    first_name: 'itachi',
    last_name: 'sasuke',
    user_permissions: {
      analytics: 'read',
      api_assets: 'write',
      apis: 'write',
      certs: 'write',
      hooks: 'write',
      idm: 'write',
      keys: 'write',
      log: 'read',
      oauth: 'write',
      policies: 'write',
      portal: 'write',
      system: 'write',
      user_groups: 'write',
      users: 'write',
      websockets: 'read'
    }
  })
};

fetch('https://{tenant}/api/users', 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://{tenant}/api/users",
  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([
    'active' => true,
    'email_address' => 'itachi@gmail.com',
    'first_name' => 'itachi',
    'last_name' => 'sasuke',
    'user_permissions' => [
        'analytics' => 'read',
        'api_assets' => 'write',
        'apis' => 'write',
        'certs' => 'write',
        'hooks' => 'write',
        'idm' => 'write',
        'keys' => 'write',
        'log' => 'read',
        'oauth' => 'write',
        'policies' => 'write',
        'portal' => 'write',
        'system' => 'write',
        'user_groups' => 'write',
        'users' => 'write',
        'websockets' => 'read'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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://{tenant}/api/users"

	payload := strings.NewReader("{\n  \"active\": true,\n  \"email_address\": \"itachi@gmail.com\",\n  \"first_name\": \"itachi\",\n  \"last_name\": \"sasuke\",\n  \"user_permissions\": {\n    \"analytics\": \"read\",\n    \"api_assets\": \"write\",\n    \"apis\": \"write\",\n    \"certs\": \"write\",\n    \"hooks\": \"write\",\n    \"idm\": \"write\",\n    \"keys\": \"write\",\n    \"log\": \"read\",\n    \"oauth\": \"write\",\n    \"policies\": \"write\",\n    \"portal\": \"write\",\n    \"system\": \"write\",\n    \"user_groups\": \"write\",\n    \"users\": \"write\",\n    \"websockets\": \"read\"\n  }\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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://{tenant}/api/users")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"active\": true,\n  \"email_address\": \"itachi@gmail.com\",\n  \"first_name\": \"itachi\",\n  \"last_name\": \"sasuke\",\n  \"user_permissions\": {\n    \"analytics\": \"read\",\n    \"api_assets\": \"write\",\n    \"apis\": \"write\",\n    \"certs\": \"write\",\n    \"hooks\": \"write\",\n    \"idm\": \"write\",\n    \"keys\": \"write\",\n    \"log\": \"read\",\n    \"oauth\": \"write\",\n    \"policies\": \"write\",\n    \"portal\": \"write\",\n    \"system\": \"write\",\n    \"user_groups\": \"write\",\n    \"users\": \"write\",\n    \"websockets\": \"read\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{tenant}/api/users")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"active\": true,\n  \"email_address\": \"itachi@gmail.com\",\n  \"first_name\": \"itachi\",\n  \"last_name\": \"sasuke\",\n  \"user_permissions\": {\n    \"analytics\": \"read\",\n    \"api_assets\": \"write\",\n    \"apis\": \"write\",\n    \"certs\": \"write\",\n    \"hooks\": \"write\",\n    \"idm\": \"write\",\n    \"keys\": \"write\",\n    \"log\": \"read\",\n    \"oauth\": \"write\",\n    \"policies\": \"write\",\n    \"portal\": \"write\",\n    \"system\": \"write\",\n    \"user_groups\": \"write\",\n    \"users\": \"write\",\n    \"websockets\": \"read\"\n  }\n}"

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

{
  "Message": "User and session have been created",
  "Meta": "6649a9e85715ec4c96cbef2f",
  "Status": "OK"
}

{
  "Message": "User object validation failed.",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "Not authorised",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "User email already exists for this org.",
  "Meta": null,
  "Status": "Error"
}

{
  "Message": "Couldn't retrieve user session details.",
  "Meta": null,
  "Status": "Error"
}