curl --request GET \
  --url https://openplatform.gateapi.io/withdraw/open/institution/otc/api/bank/country/list \
  --header 'X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>' \
  --header 'X-GatePay-Nonce: <x-gatepay-nonce>' \
  --header 'X-GatePay-On-Behalf-Of: <x-gatepay-on-behalf-of>' \
  --header 'X-GatePay-Signature: <x-gatepay-signature>' \
  --header 'X-GatePay-Timestamp: <x-gatepay-timestamp>'

import requests

url = "https://openplatform.gateapi.io/withdraw/open/institution/otc/api/bank/country/list"

headers = {
    "X-GatePay-Certificate-ClientId": "<x-gatepay-certificate-clientid>",
    "X-GatePay-Signature": "<x-gatepay-signature>",
    "X-GatePay-Timestamp": "<x-gatepay-timestamp>",
    "X-GatePay-Nonce": "<x-gatepay-nonce>",
    "X-GatePay-On-Behalf-Of": "<x-gatepay-on-behalf-of>"
}

response = requests.get(url, headers=headers)

print(response.text)

const options = {
  method: 'GET',
  headers: {
    'X-GatePay-Certificate-ClientId': '<x-gatepay-certificate-clientid>',
    'X-GatePay-Signature': '<x-gatepay-signature>',
    'X-GatePay-Timestamp': '<x-gatepay-timestamp>',
    'X-GatePay-Nonce': '<x-gatepay-nonce>',
    'X-GatePay-On-Behalf-Of': '<x-gatepay-on-behalf-of>'
  }
};

fetch('https://openplatform.gateapi.io/withdraw/open/institution/otc/api/bank/country/list', 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/withdraw/open/institution/otc/api/bank/country/list",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "X-GatePay-Certificate-ClientId: <x-gatepay-certificate-clientid>",
    "X-GatePay-Nonce: <x-gatepay-nonce>",
    "X-GatePay-On-Behalf-Of: <x-gatepay-on-behalf-of>",
    "X-GatePay-Signature: <x-gatepay-signature>",
    "X-GatePay-Timestamp: <x-gatepay-timestamp>"
  ],
]);

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

curl_close($curl);

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

HttpResponse<String> response = Unirest.get("https://openplatform.gateapi.io/withdraw/open/institution/otc/api/bank/country/list")
  .header("X-GatePay-Certificate-ClientId", "<x-gatepay-certificate-clientid>")
  .header("X-GatePay-Signature", "<x-gatepay-signature>")
  .header("X-GatePay-Timestamp", "<x-gatepay-timestamp>")
  .header("X-GatePay-Nonce", "<x-gatepay-nonce>")
  .header("X-GatePay-On-Behalf-Of", "<x-gatepay-on-behalf-of>")
  .asString();

package main

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

func main() {

	url := "https://openplatform.gateapi.io/withdraw/open/institution/otc/api/bank/country/list"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-GatePay-Certificate-ClientId", "<x-gatepay-certificate-clientid>")
	req.Header.Add("X-GatePay-Signature", "<x-gatepay-signature>")
	req.Header.Add("X-GatePay-Timestamp", "<x-gatepay-timestamp>")
	req.Header.Add("X-GatePay-Nonce", "<x-gatepay-nonce>")
	req.Header.Add("X-GatePay-On-Behalf-Of", "<x-gatepay-on-behalf-of>")

	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/withdraw/open/institution/otc/api/bank/country/list")

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

request = Net::HTTP::Get.new(url)
request["X-GatePay-Certificate-ClientId"] = '<x-gatepay-certificate-clientid>'
request["X-GatePay-Signature"] = '<x-gatepay-signature>'
request["X-GatePay-Timestamp"] = '<x-gatepay-timestamp>'
request["X-GatePay-Nonce"] = '<x-gatepay-nonce>'
request["X-GatePay-On-Behalf-Of"] = '<x-gatepay-on-behalf-of>'

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

{
  "code": "<string>",
  "status": "<string>",
  "data": [
    {
      "countryId": 123,
      "countryName": "<string>",
      "countryCn": "<string>"
    }
  ]
}