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<?php
class SignatureGenerator
{
        public static function generateSignature(string $publicKey, string $jsonString, string $secret_key): string
    {
        $text = $publicKey . $jsonString . $publicKey;
        $hashedBytes = hash_hmac('sha512', $text, $secret_key);
        return base64_encode($hashedBytes);
    }
    public static function main(array $args): void
    {
        $public_key = 'api_pk_8f8a8k8e8k8e8y8';
        $json_string = '{"amount": "100", "currency": "USD"}';
        $secret_key = 'api_sk_8f8a8k8e8k8e8y8';
        $signature = self::generateSignature($public_key, $json_string, $secret_key);
        echo $signature . "\n";
    }    
}

SignatureGenerator::main([]);

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const crypto = require('crypto');

function generateSignature(publicKey, jsonString, secretKey) {
	const data = publicKey + jsonString + publicKey;
	const hmac = crypto.createHmac('sha512', secretKey);
	hmac.update(data);
	const hash = hmac.digest();
	const hexHash = hash.toString('hex');
	return Buffer.from(hexHash).toString('base64');
}

const publicKey = 'api_pk_8f8a8k8e8k8e8y8';
const jsonString = '{"amount": "100", "currency": "USD"}'
const secretKey = 'api_sk_8f8a8k8e8k8e8y8';

const signature = generateSignature(publicKey, jsonString, secretKey);
console.log(signature);

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//dependency - https://mvnrepository.com/artifact/com.google.guava/guava
import com.google.common.hash.Hashing;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class SignatureGenerator {

  public static String generateSignature(String publicKey, String jsonString, String secretKey) {
    String text = publicKey + jsonString + publicKey;
    byte[] hashedBytes = Hashing.hmacSha512(secretKey.getBytes())
        .hashString(text, StandardCharsets.UTF_8).toString().getBytes();
    return Base64.getEncoder().encodeToString(hashedBytes);
  }

  public static void main(String[] args) {
    String publicKey = "api_pk_8f8a8k8e8k8e8y8";
    String jsonString = "{\"amount\": \"100\", \"currency\": \"USD\"}";
    String secretKey = "api_sk_8f8a8k8e8k8e8y8";
    String signature = generateSignature(publicKey, jsonString, secretKey);
    System.out.println(signature);
  }

}

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using System;
using System.Security.Cryptography;
using System.Text;

public class SignatureGenerator {
    
    public static string GenerateSignature(string publicKey, string jsonString, string secretKey) {
        string data = publicKey + jsonString + publicKey;
        byte[] secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);
        byte[] dataBytes = Encoding.UTF8.GetBytes(data);
        using (var hmac = new HMACSHA512(secretKeyBytes)) {
            byte[] hashBytes = hmac.ComputeHash(dataBytes);
            string hexHash = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
            byte[] base64Bytes = Encoding.UTF8.GetBytes(hexHash);
            string base64Signature = Convert.ToBase64String(base64Bytes);
            return base64Signature;
        }
    }
    
    public static void Main(string[] args) {
        string publicKey = "api_pk_8f8a8k8e8k8e8y8";
        string jsonString = "{\"amount\": \"100\", \"currency\": \"USD\"}";
        string secretKey = "api_sk_8f8a8k8e8k8e8y8";
        string signature = SignatureGenerator.GenerateSignature(publicKey, jsonString, secretKey);
        Console.WriteLine(signature);
    }
}

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package com.solidgate.examples

// https://mvnrepository.com/artifact/com.google.guava/guava
import com.google.common.hash.Hashing
import java.nio.charset.StandardCharsets
import java.util.Base64

class SignatureGenerator {
    companion object {
        fun generateSignature(publicKey: String, jsonString: String, secretKey: String): String {
            val text = publicKey + jsonString + publicKey
            val hashedBytes = Hashing.hmacSha512(secretKey.toByteArray())
                .hashString(text, StandardCharsets.UTF_8).toString().toByteArray()
            return Base64.getEncoder().encodeToString(hashedBytes)
        }
    }
}

fun main() {
    val publicKey = "api_pk_8f8a8k8e8k8e8y8"
    val jsonString = "{\"amount\": \"100\", \"currency\": \"USD\"}"
    val secretKey = "api_sk_8f8a8k8e8k8e8y8"
    val signature = SignatureGenerator.generateSignature(publicKey, jsonString, secretKey)
    println(signature)
}

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import hashlib
import hmac
import base64

def generateSignature(public_key, json_string, secret_key):
    data = public_key + json_string + public_key
    hmac_hash = hmac.new(secret_key.encode('utf-8'), data.encode('utf-8'), hashlib.sha512).digest()
    return base64.b64encode(hmac_hash.hex().encode('utf-8')).decode('utf-8')

public_key = "api_pk_8f8a8k8e8k8e8y8"
json_string = "{\"amount\": \"100\", \"currency\": \"USD\"}"
secret_key = "api_sk_8f8a8k8e8k8e8y8"

signature = generateSignature(public_key, json_string, secret_key)
print(signature)

//This code is intended for Python 3; please use Python 3 or newer versions to ensure compatibility.

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require 'openssl'
require 'base64'

def generate_signature(public_key, json_string, secret_key)
  digest = OpenSSL::Digest.new('sha512')
  instance = OpenSSL::HMAC.new(secret_key, digest)
  instance.update(public_key + json_string + public_key)
  Base64.strict_encode64(instance.hexdigest)
end

# Example usage
public_key = "api_pk_8f8a8k8e8k8e8y8"
json_string = '{"amount": "100", "currency": "USD"}'
secret_key = "api_sk_8f8a8k8e8k8e8y8"

signature = generate_signature(public_key, json_string, secret_key)
puts "Signature value: #{signature}"

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// Delay mechanism
switch resp.StatusCode {
case http.StatusTooManyRequests, http.StatusServiceUnavailable:
    waitSec, _ := strconv.Atoi(resp.Header.Get(`Retry-After`))
    waitDur := time.Second * time.Duration(waitSec)

    time.Sleep(mmax(waitDur, time.Second*5))
    // wait is done, good to send next request
    continue
default:
    // good to send next request right away
}