curl --request POST \
  --url https://sandbox.rollfi.xyz/userOnboarding/addW4Information \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "addW4Information",
  "w4Information": {
    "userId": "D9363C3E-91D4-4B04-ACE4-41509B306844",
    "w4FilingStatus": "Head of household",
    "haveMultipleJob": true,
    "dependents": 3,
    "dependentsAbove18": 2,
    "otherIncome": 1500,
    "otherDeduction": 150,
    "extraWithholding": 10
  }
}
'

import requests

url = "https://sandbox.rollfi.xyz/userOnboarding/addW4Information"

payload = {
    "method": "addW4Information",
    "w4Information": {
        "userId": "D9363C3E-91D4-4B04-ACE4-41509B306844",
        "w4FilingStatus": "Head of household",
        "haveMultipleJob": True,
        "dependents": 3,
        "dependentsAbove18": 2,
        "otherIncome": 1500,
        "otherDeduction": 150,
        "extraWithholding": 10
    }
}
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: 'addW4Information',
    w4Information: {
      userId: 'D9363C3E-91D4-4B04-ACE4-41509B306844',
      w4FilingStatus: 'Head of household',
      haveMultipleJob: true,
      dependents: 3,
      dependentsAbove18: 2,
      otherIncome: 1500,
      otherDeduction: 150,
      extraWithholding: 10
    }
  })
};

fetch('https://sandbox.rollfi.xyz/userOnboarding/addW4Information', 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/userOnboarding/addW4Information",
  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' => 'addW4Information',
    'w4Information' => [
        'userId' => 'D9363C3E-91D4-4B04-ACE4-41509B306844',
        'w4FilingStatus' => 'Head of household',
        'haveMultipleJob' => true,
        'dependents' => 3,
        'dependentsAbove18' => 2,
        'otherIncome' => 1500,
        'otherDeduction' => 150,
        'extraWithholding' => 10
    ]
  ]),
  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/userOnboarding/addW4Information"

	payload := strings.NewReader("{\n  \"method\": \"addW4Information\",\n  \"w4Information\": {\n    \"userId\": \"D9363C3E-91D4-4B04-ACE4-41509B306844\",\n    \"w4FilingStatus\": \"Head of household\",\n    \"haveMultipleJob\": true,\n    \"dependents\": 3,\n    \"dependentsAbove18\": 2,\n    \"otherIncome\": 1500,\n    \"otherDeduction\": 150,\n    \"extraWithholding\": 10\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/userOnboarding/addW4Information")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"method\": \"addW4Information\",\n  \"w4Information\": {\n    \"userId\": \"D9363C3E-91D4-4B04-ACE4-41509B306844\",\n    \"w4FilingStatus\": \"Head of household\",\n    \"haveMultipleJob\": true,\n    \"dependents\": 3,\n    \"dependentsAbove18\": 2,\n    \"otherIncome\": 1500,\n    \"otherDeduction\": 150,\n    \"extraWithholding\": 10\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.rollfi.xyz/userOnboarding/addW4Information")

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\": \"addW4Information\",\n  \"w4Information\": {\n    \"userId\": \"D9363C3E-91D4-4B04-ACE4-41509B306844\",\n    \"w4FilingStatus\": \"Head of household\",\n    \"haveMultipleJob\": true,\n    \"dependents\": 3,\n    \"dependentsAbove18\": 2,\n    \"otherIncome\": 1500,\n    \"otherDeduction\": 150,\n    \"extraWithholding\": 10\n  }\n}"

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

{
  "w4Information": {
    "userId": "D9363C3E-91D4-4B04-ACE4-41509B306844",
    "status": "Ready",
    "message": "The W4Information for jacob king has been saved successfully."
  }
}

{
  "error": {
    "code": 400,
    "message": "EmployeeId is mandatory and cannot be empty."
  }
}