curl --request POST \
  --url https://api-sandbox.endl.io/api/v0/customer/{businessId}/card-users \
  --header 'Api-Key: <api-key>' \
  --header 'Api-Version: <api-version>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "firstName": "Ada",
  "lastName": "Lovelace",
  "email": "ada@example.com",
  "phoneCountryCode": "1",
  "phoneNumber": "5555550100"
}
'

import requests

url = "https://api-sandbox.endl.io/api/v0/customer/{businessId}/card-users"

payload = {
    "firstName": "Ada",
    "lastName": "Lovelace",
    "email": "ada@example.com",
    "phoneCountryCode": "1",
    "phoneNumber": "5555550100"
}
headers = {
    "Api-Version": "<api-version>",
    "Api-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'Api-Version': '<api-version>',
    'Api-Key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    firstName: 'Ada',
    lastName: 'Lovelace',
    email: 'ada@example.com',
    phoneCountryCode: '1',
    phoneNumber: '5555550100'
  })
};

fetch('https://api-sandbox.endl.io/api/v0/customer/{businessId}/card-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://api-sandbox.endl.io/api/v0/customer/{businessId}/card-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([
    'firstName' => 'Ada',
    'lastName' => 'Lovelace',
    'email' => 'ada@example.com',
    'phoneCountryCode' => '1',
    'phoneNumber' => '5555550100'
  ]),
  CURLOPT_HTTPHEADER => [
    "Api-Key: <api-key>",
    "Api-Version: <api-version>",
    "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-sandbox.endl.io/api/v0/customer/{businessId}/card-users"

	payload := strings.NewReader("{\n  \"firstName\": \"Ada\",\n  \"lastName\": \"Lovelace\",\n  \"email\": \"ada@example.com\",\n  \"phoneCountryCode\": \"1\",\n  \"phoneNumber\": \"5555550100\"\n}")

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

	req.Header.Add("Api-Version", "<api-version>")
	req.Header.Add("Api-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.post("https://api-sandbox.endl.io/api/v0/customer/{businessId}/card-users")
  .header("Api-Version", "<api-version>")
  .header("Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"firstName\": \"Ada\",\n  \"lastName\": \"Lovelace\",\n  \"email\": \"ada@example.com\",\n  \"phoneCountryCode\": \"1\",\n  \"phoneNumber\": \"5555550100\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.endl.io/api/v0/customer/{businessId}/card-users")

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

request = Net::HTTP::Post.new(url)
request["Api-Version"] = '<api-version>'
request["Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"firstName\": \"Ada\",\n  \"lastName\": \"Lovelace\",\n  \"email\": \"ada@example.com\",\n  \"phoneCountryCode\": \"1\",\n  \"phoneNumber\": \"5555550100\"\n}"

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

{
  "cardholderId": "cus_6OzDYZWl5Aim37RwvZfZ",
  "businessId": "cus_HUCgMg1iqWb379FMNvaJ",
  "firstName": "Ada",
  "lastName": "Lovelace",
  "email": "ada@example.com",
  "status": "active"
}

{
  "code": 400,
  "message": "Cardholder could not be created",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCRD_1010",
      "message": "Cardholder could not be created",
      "field": null
    }
  ]
}

{
  "code": 401,
  "message": "Partner API key required",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1004",
      "message": "Partner API key required",
      "field": null
    }
  ]
}

{
  "code": 403,
  "message": "Access denied / missing cards permission",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRCORE_1005",
      "message": "Access denied / missing cards permission",
      "field": null
    }
  ]
}

{
  "code": 404,
  "message": "Reference not found",
  "status": "ERROR",
  "data": null,
  "errors": [
    {
      "code": "ERRREF_1001",
      "message": "Reference not found",
      "field": "userId"
    }
  ]
}