Carry timestamp and sign in the request.

All requests must carry appid, timestamp and sign.

Please use the appid assigned to you by AlchemyPay.
The timestamp uses the current time (UTC+8). The difference between the requested timestamp and the current time cannot exceed 5 minutes, otherwise the request will not be accepted.
Sign is a signature, used to verify your identity. The following is an example of generating a timestamp and signature

public class MerSignCheckUtil {

    private static final char[] HEX_DIGITS = { '0', '1', '2', '3', '4', '5',
        '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    public static String getMerSign(String appId, String appSecret, String timestamp) {
        return encode("sha1", appId  + appSecret + timestamp);
    }


    private static String encode(String algorithm, String value) {
        if (value == null) {
            return null;
        }
        try {
            MessageDigest messageDigest
                = MessageDigest.getInstance(algorithm);
            messageDigest.update(value.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }
}


// Generate timestamp and sign
public static void main(String[] args) {
        String timestamp = String.valueOf(System.currentTimeMillis());
        System.out.println("timestamp = "+ timestamp);
        System.out.println("\n");
        System.out.println(MerSignCheckUtil.getMerSign("f83Is2**********", "4Yn*************",  timestamp)); 
    }}

#Python 3.7.4 
import hashlib
from time import time


def getMerSign(appId, appSecret, timestamp):
    strr = appId + appSecret + str(timestamp)
    encoded_str = strr.encode()
    hash_obj = hashlib.sha1(encoded_str)
    hexa_value = hash_obj.hexdigest()
    return hexa_value


timestamp = int(time() * 1000)
print("timestamp = ", timestamp)
print("\n")
res = getMerSign("f83Is2**********", "4Yn*************", timestamp)
print(res)

//PHP 8.0.7
<?php
function getMerSign($appId, $appSecret, $timestamp){
  $str = $appId.$appSecret.strval($timestamp);
  return sha1($str);
}
$timestamp = floor(microtime(true) * 1000);
printf("timestamp = %d\n", $timestamp);
$res = getMerSign("f83Is2**********", "4Yn*************", $timestamp);
print($res);
 ?>

//node v14.15.1
const sha1 = require('js-sha1');


function getMerSign(appId, appSecret, timestamp) {
  return sha1(appId + appSecret + String(timestamp));
}

//go version go1.18.2
package main

import (
	"crypto/sha1"
	"encoding/hex"
	"strconv"
)

func getMerSign(appId string, appSecret string, timestamp int64) string {
	s := appId + appSecret + strconv.FormatInt(timestamp, 10)
	h := sha1.New()
	h.Write([]byte(s))
	//io.WriteString(h, s)
	return hex.EncodeToString(h.Sum(nil))
}