curl --request POST \
  --url https://sandbox.elementpay.net/api/v1/partner/customers \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "partner_customer_ref": "cust-ke-001",
  "type": "individual",
  "profile": {
    "first_name": "Jane",
    "last_name": "Doe",
    "email": "jane@example.com",
    "date_of_birth": "1990-01-15",
    "country_of_residence": "GB",
    "phone": "+447700900123",
    "gender": "f",
    "address": {
      "line_1": "1 Example Street",
      "city": "London",
      "country": "GB",
      "postal_code": "E1 6AN"
    }
  }
}
'

import requests

url = "https://sandbox.elementpay.net/api/v1/partner/customers"

payload = {
    "partner_customer_ref": "cust-ke-001",
    "type": "individual",
    "profile": {
        "first_name": "Jane",
        "last_name": "Doe",
        "email": "jane@example.com",
        "date_of_birth": "1990-01-15",
        "country_of_residence": "GB",
        "phone": "+447700900123",
        "gender": "f",
        "address": {
            "line_1": "1 Example Street",
            "city": "London",
            "country": "GB",
            "postal_code": "E1 6AN"
        }
    }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    partner_customer_ref: 'cust-ke-001',
    type: 'individual',
    profile: {
      first_name: 'Jane',
      last_name: 'Doe',
      email: 'jane@example.com',
      date_of_birth: '1990-01-15',
      country_of_residence: 'GB',
      phone: '+447700900123',
      gender: 'f',
      address: {
        line_1: '1 Example Street',
        city: 'London',
        country: 'GB',
        postal_code: 'E1 6AN'
      }
    }
  })
};

fetch('https://sandbox.elementpay.net/api/v1/partner/customers', 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.elementpay.net/api/v1/partner/customers",
  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([
    'partner_customer_ref' => 'cust-ke-001',
    'type' => 'individual',
    'profile' => [
        'first_name' => 'Jane',
        'last_name' => 'Doe',
        'email' => 'jane@example.com',
        'date_of_birth' => '1990-01-15',
        'country_of_residence' => 'GB',
        'phone' => '+447700900123',
        'gender' => 'f',
        'address' => [
                'line_1' => '1 Example Street',
                'city' => 'London',
                'country' => 'GB',
                'postal_code' => 'E1 6AN'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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.elementpay.net/api/v1/partner/customers"

	payload := strings.NewReader("{\n  \"partner_customer_ref\": \"cust-ke-001\",\n  \"type\": \"individual\",\n  \"profile\": {\n    \"first_name\": \"Jane\",\n    \"last_name\": \"Doe\",\n    \"email\": \"jane@example.com\",\n    \"date_of_birth\": \"1990-01-15\",\n    \"country_of_residence\": \"GB\",\n    \"phone\": \"+447700900123\",\n    \"gender\": \"f\",\n    \"address\": {\n      \"line_1\": \"1 Example Street\",\n      \"city\": \"London\",\n      \"country\": \"GB\",\n      \"postal_code\": \"E1 6AN\"\n    }\n  }\n}")

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

	req.Header.Add("X-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://sandbox.elementpay.net/api/v1/partner/customers")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"partner_customer_ref\": \"cust-ke-001\",\n  \"type\": \"individual\",\n  \"profile\": {\n    \"first_name\": \"Jane\",\n    \"last_name\": \"Doe\",\n    \"email\": \"jane@example.com\",\n    \"date_of_birth\": \"1990-01-15\",\n    \"country_of_residence\": \"GB\",\n    \"phone\": \"+447700900123\",\n    \"gender\": \"f\",\n    \"address\": {\n      \"line_1\": \"1 Example Street\",\n      \"city\": \"London\",\n      \"country\": \"GB\",\n      \"postal_code\": \"E1 6AN\"\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.elementpay.net/api/v1/partner/customers")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"partner_customer_ref\": \"cust-ke-001\",\n  \"type\": \"individual\",\n  \"profile\": {\n    \"first_name\": \"Jane\",\n    \"last_name\": \"Doe\",\n    \"email\": \"jane@example.com\",\n    \"date_of_birth\": \"1990-01-15\",\n    \"country_of_residence\": \"GB\",\n    \"phone\": \"+447700900123\",\n    \"gender\": \"f\",\n    \"address\": {\n      \"line_1\": \"1 Example Street\",\n      \"city\": \"London\",\n      \"country\": \"GB\",\n      \"postal_code\": \"E1 6AN\"\n    }\n  }\n}"

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

{
  "status": "error",
  "message": "Validation error",
  "data": {
    "field": "country"
  }
}