curl --request POST \
  --url https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url \
  --header 'Content-Type: application/json' \
  --header 'X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>' \
  --header 'X-GatePay-Merchant-Id: <x-gatepay-merchant-id>' \
  --header 'X-GatePay-On-Behalf-Of: <x-gatepay-on-behalf-of>' \
  --data '
{
  "expireSeconds": 86400
}
'

import requests

url = "https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url"

payload = { "expireSeconds": 86400 }
headers = {
    "X-GatePay-On-Behalf-Of": "<x-gatepay-on-behalf-of>",
    "X-GatePay-Merchant-Id": "<x-gatepay-merchant-id>",
    "X-GatePay-Certificate-ClientId": "<x-gatepay-certificate-clientid>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-GatePay-On-Behalf-Of': '<x-gatepay-on-behalf-of>',
    'X-GatePay-Merchant-Id': '<x-gatepay-merchant-id>',
    'X-GatePay-Certificate-ClientId': '<x-gatepay-certificate-clientid>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({expireSeconds: 86400})
};

fetch('https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url', 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://openplatform.gateapi.io/pay-cashier/open/v1/certification/url",
  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([
    'expireSeconds' => 86400
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>",
    "X-GatePay-Merchant-Id: <x-gatepay-merchant-id>",
    "X-GatePay-On-Behalf-Of: <x-gatepay-on-behalf-of>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

HttpResponse<String> response = Unirest.post("https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url")
  .header("X-GatePay-On-Behalf-Of", "<x-gatepay-on-behalf-of>")
  .header("X-GatePay-Merchant-Id", "<x-gatepay-merchant-id>")
  .header("X-GatePay-Certificate-ClientId", "<x-gatepay-certificate-clientid>")
  .header("Content-Type", "application/json")
  .body("{\n  \"expireSeconds\": 86400\n}")
  .asString();

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url"

	payload := strings.NewReader("{\n  \"expireSeconds\": 86400\n}")

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

	req.Header.Add("X-GatePay-On-Behalf-Of", "<x-gatepay-on-behalf-of>")
	req.Header.Add("X-GatePay-Merchant-Id", "<x-gatepay-merchant-id>")
	req.Header.Add("X-GatePay-Certificate-ClientId", "<x-gatepay-certificate-clientid>")
	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))

}

require 'uri'
require 'net/http'

url = URI("https://openplatform.gateapi.io/pay-cashier/open/v1/certification/url")

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

request = Net::HTTP::Post.new(url)
request["X-GatePay-On-Behalf-Of"] = '<x-gatepay-on-behalf-of>'
request["X-GatePay-Merchant-Id"] = '<x-gatepay-merchant-id>'
request["X-GatePay-Certificate-ClientId"] = '<x-gatepay-certificate-clientid>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"expireSeconds\": 86400\n}"

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

{
  "code": "0",
  "message": "success",
  "data": {
    "authUrl": "<string>",
    "subAccountId": 123,
    "expireTime": 123,
    "requestId": "<string>"
  }
}