curl --request POST \
  --url https://sandbox.rollfi.xyz/adminPortal/addUser \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "addUser",
  "user": {
    "companyId": "33A04AFB-4317-464A-B1E0-BAB610086174",
    "firstName": "Marcus",
    "middleName": "Austin",
    "lastName": "Steve",
    "email": "mar@sto.com",
    "phoneNumber": "9889890989",
    "dateOfJoin": "2000-01-01",
    "workerType": "W2",
    "jobTitle": "Manager",
    "companyLocationCategory": "Remote",
    "stateCode": "FL",
    "companyLocationId": ""
  }
}
'

import requests

url = "https://sandbox.rollfi.xyz/adminPortal/addUser"

payload = {
    "method": "addUser",
    "user": {
        "companyId": "33A04AFB-4317-464A-B1E0-BAB610086174",
        "firstName": "Marcus",
        "middleName": "Austin",
        "lastName": "Steve",
        "email": "mar@sto.com",
        "phoneNumber": "9889890989",
        "dateOfJoin": "2000-01-01",
        "workerType": "W2",
        "jobTitle": "Manager",
        "companyLocationCategory": "Remote",
        "stateCode": "FL",
        "companyLocationId": ""
    }
}
headers = {
    "Authorization": "Basic <encoded-value>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Basic <encoded-value>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    method: 'addUser',
    user: {
      companyId: '33A04AFB-4317-464A-B1E0-BAB610086174',
      firstName: 'Marcus',
      middleName: 'Austin',
      lastName: 'Steve',
      email: 'mar@sto.com',
      phoneNumber: '9889890989',
      dateOfJoin: '2000-01-01',
      workerType: 'W2',
      jobTitle: 'Manager',
      companyLocationCategory: 'Remote',
      stateCode: 'FL',
      companyLocationId: ''
    }
  })
};

fetch('https://sandbox.rollfi.xyz/adminPortal/addUser', 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://sandbox.rollfi.xyz/adminPortal/addUser",
  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([
    'method' => 'addUser',
    'user' => [
        'companyId' => '33A04AFB-4317-464A-B1E0-BAB610086174',
        'firstName' => 'Marcus',
        'middleName' => 'Austin',
        'lastName' => 'Steve',
        'email' => 'mar@sto.com',
        'phoneNumber' => '9889890989',
        'dateOfJoin' => '2000-01-01',
        'workerType' => 'W2',
        'jobTitle' => 'Manager',
        'companyLocationCategory' => 'Remote',
        'stateCode' => 'FL',
        'companyLocationId' => ''
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "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://sandbox.rollfi.xyz/adminPortal/addUser"

	payload := strings.NewReader("{\n  \"method\": \"addUser\",\n  \"user\": {\n    \"companyId\": \"33A04AFB-4317-464A-B1E0-BAB610086174\",\n    \"firstName\": \"Marcus\",\n    \"middleName\": \"Austin\",\n    \"lastName\": \"Steve\",\n    \"email\": \"mar@sto.com\",\n    \"phoneNumber\": \"9889890989\",\n    \"dateOfJoin\": \"2000-01-01\",\n    \"workerType\": \"W2\",\n    \"jobTitle\": \"Manager\",\n    \"companyLocationCategory\": \"Remote\",\n    \"stateCode\": \"FL\",\n    \"companyLocationId\": \"\"\n  }\n}")

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

	req.Header.Add("Authorization", "Basic <encoded-value>")
	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://sandbox.rollfi.xyz/adminPortal/addUser")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"method\": \"addUser\",\n  \"user\": {\n    \"companyId\": \"33A04AFB-4317-464A-B1E0-BAB610086174\",\n    \"firstName\": \"Marcus\",\n    \"middleName\": \"Austin\",\n    \"lastName\": \"Steve\",\n    \"email\": \"mar@sto.com\",\n    \"phoneNumber\": \"9889890989\",\n    \"dateOfJoin\": \"2000-01-01\",\n    \"workerType\": \"W2\",\n    \"jobTitle\": \"Manager\",\n    \"companyLocationCategory\": \"Remote\",\n    \"stateCode\": \"FL\",\n    \"companyLocationId\": \"\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.rollfi.xyz/adminPortal/addUser")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Basic <encoded-value>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"method\": \"addUser\",\n  \"user\": {\n    \"companyId\": \"33A04AFB-4317-464A-B1E0-BAB610086174\",\n    \"firstName\": \"Marcus\",\n    \"middleName\": \"Austin\",\n    \"lastName\": \"Steve\",\n    \"email\": \"mar@sto.com\",\n    \"phoneNumber\": \"9889890989\",\n    \"dateOfJoin\": \"2000-01-01\",\n    \"workerType\": \"W2\",\n    \"jobTitle\": \"Manager\",\n    \"companyLocationCategory\": \"Remote\",\n    \"stateCode\": \"FL\",\n    \"companyLocationId\": \"\"\n  }\n}"

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