curl --request POST \
  --url https://sandbox-pay.epay123.net/api/pay/close \
  --header 'Content-Type: application/json' \
  --data '
{
  "version": "1.0.1",
  "signType": "MD5",
  "sign": "xxxxxx",
  "reqTime": "1622016572190",
  "mchNo": "M1234567890",
  "appId": "88808634c46ff1a7807888888",
  "mchOrderNo": "20160427210604000490",
  "payOrderId": "P202106181104177050002"
}
'

import requests

url = "https://sandbox-pay.epay123.net/api/pay/close"

payload = {
    "version": "1.0.1",
    "signType": "MD5",
    "sign": "xxxxxx",
    "reqTime": "1622016572190",
    "mchNo": "M1234567890",
    "appId": "88808634c46ff1a7807888888",
    "mchOrderNo": "20160427210604000490",
    "payOrderId": "P202106181104177050002"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    version: '1.0.1',
    signType: 'MD5',
    sign: 'xxxxxx',
    reqTime: '1622016572190',
    mchNo: 'M1234567890',
    appId: '88808634c46ff1a7807888888',
    mchOrderNo: '20160427210604000490',
    payOrderId: 'P202106181104177050002'
  })
};

fetch('https://sandbox-pay.epay123.net/api/pay/close', 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-pay.epay123.net/api/pay/close",
  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([
    'version' => '1.0.1',
    'signType' => 'MD5',
    'sign' => 'xxxxxx',
    'reqTime' => '1622016572190',
    'mchNo' => 'M1234567890',
    'appId' => '88808634c46ff1a7807888888',
    'mchOrderNo' => '20160427210604000490',
    'payOrderId' => 'P202106181104177050002'
  ]),
  CURLOPT_HTTPHEADER => [
    "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://sandbox-pay.epay123.net/api/pay/close"

	payload := strings.NewReader("{\n  \"version\": \"1.0.1\",\n  \"signType\": \"MD5\",\n  \"sign\": \"xxxxxx\",\n  \"reqTime\": \"1622016572190\",\n  \"mchNo\": \"M1234567890\",\n  \"appId\": \"88808634c46ff1a7807888888\",\n  \"mchOrderNo\": \"20160427210604000490\",\n  \"payOrderId\": \"P202106181104177050002\"\n}")

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

	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-pay.epay123.net/api/pay/close")
  .header("Content-Type", "application/json")
  .body("{\n  \"version\": \"1.0.1\",\n  \"signType\": \"MD5\",\n  \"sign\": \"xxxxxx\",\n  \"reqTime\": \"1622016572190\",\n  \"mchNo\": \"M1234567890\",\n  \"appId\": \"88808634c46ff1a7807888888\",\n  \"mchOrderNo\": \"20160427210604000490\",\n  \"payOrderId\": \"P202106181104177050002\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox-pay.epay123.net/api/pay/close")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"version\": \"1.0.1\",\n  \"signType\": \"MD5\",\n  \"sign\": \"xxxxxx\",\n  \"reqTime\": \"1622016572190\",\n  \"mchNo\": \"M1234567890\",\n  \"appId\": \"88808634c46ff1a7807888888\",\n  \"mchOrderNo\": \"20160427210604000490\",\n  \"payOrderId\": \"P202106181104177050002\"\n}"

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

{
  "code": 200,
  "msg": "成功",
  "data": {},
  "sign": "<string>"
}