curl --request POST \
  --url https://api.xpaycheckout.com/customer/create \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerDetails": {
    "name": "John Doe",
    "email": "john.doe@example.com",
    "contactNumber": "+919123456789",
    "customerAddress": {
      "addressLine1": "123 Main St",
      "addressLine2": "Apt 1",
      "city": "New York",
      "state": "NY",
      "country": "US",
      "postalCode": "2424"
    }
  }
}
'

import requests

url = "https://api.xpaycheckout.com/customer/create"

payload = { "customerDetails": {
        "name": "John Doe",
        "email": "john.doe@example.com",
        "contactNumber": "+919123456789",
        "customerAddress": {
            "addressLine1": "123 Main St",
            "addressLine2": "Apt 1",
            "city": "New York",
            "state": "NY",
            "country": "US",
            "postalCode": "2424"
        }
    } }
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({
    customerDetails: {
      name: 'John Doe',
      email: 'john.doe@example.com',
      contactNumber: '+919123456789',
      customerAddress: {
        addressLine1: '123 Main St',
        addressLine2: 'Apt 1',
        city: 'New York',
        state: 'NY',
        country: 'US',
        postalCode: '2424'
      }
    }
  })
};

fetch('https://api.xpaycheckout.com/customer/create', 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://api.xpaycheckout.com/customer/create",
  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([
    'customerDetails' => [
        'name' => 'John Doe',
        'email' => 'john.doe@example.com',
        'contactNumber' => '+919123456789',
        'customerAddress' => [
                'addressLine1' => '123 Main St',
                'addressLine2' => 'Apt 1',
                'city' => 'New York',
                'state' => 'NY',
                'country' => 'US',
                'postalCode' => '2424'
        ]
    ]
  ]),
  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://api.xpaycheckout.com/customer/create"

	payload := strings.NewReader("{\n  \"customerDetails\": {\n    \"name\": \"John Doe\",\n    \"email\": \"john.doe@example.com\",\n    \"contactNumber\": \"+919123456789\",\n    \"customerAddress\": {\n      \"addressLine1\": \"123 Main St\",\n      \"addressLine2\": \"Apt 1\",\n      \"city\": \"New York\",\n      \"state\": \"NY\",\n      \"country\": \"US\",\n      \"postalCode\": \"2424\"\n    }\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://api.xpaycheckout.com/customer/create")
  .header("Authorization", "Basic <encoded-value>")
  .header("Content-Type", "application/json")
  .body("{\n  \"customerDetails\": {\n    \"name\": \"John Doe\",\n    \"email\": \"john.doe@example.com\",\n    \"contactNumber\": \"+919123456789\",\n    \"customerAddress\": {\n      \"addressLine1\": \"123 Main St\",\n      \"addressLine2\": \"Apt 1\",\n      \"city\": \"New York\",\n      \"state\": \"NY\",\n      \"country\": \"US\",\n      \"postalCode\": \"2424\"\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.xpaycheckout.com/customer/create")

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  \"customerDetails\": {\n    \"name\": \"John Doe\",\n    \"email\": \"john.doe@example.com\",\n    \"contactNumber\": \"+919123456789\",\n    \"customerAddress\": {\n      \"addressLine1\": \"123 Main St\",\n      \"addressLine2\": \"Apt 1\",\n      \"city\": \"New York\",\n      \"state\": \"NY\",\n      \"country\": \"US\",\n      \"postalCode\": \"2424\"\n    }\n  }\n}"

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

{
  "customerId": "cus_Tfd3Jq1tZxPjYVhRQW2r3"
}

{
  "errorCode": "bad_request",
  "errorDescription": "Failed to read request"
}