shipping-portal/app/Classes/General/WePostHelper.php

<?php

namespace App\Classes\General;


class WePostHelper
{

    /**
     * @param string $clientId
     * @param string $clientSecrent
     * @param string $type
     * @return string
     */
    static function generateSignature(string $clientId, string $clientSecrent, string $type){
        // public parameters
        $timestamp = 1234; //time();

        $params = [
            'client_id' => $clientId,
            'type' => $type,
            'timestamp' => $timestamp
        ];

        // $businessParams = [
        //     'test1' => '1',
        // ];

        ksort($params);
        $str = '';
        foreach ($params as $key => $value) {
            if(is_array($value)) {
                $str .= $key.json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
                continue;
            }
            $str .= $key. $value;
        }
        $str = $clientSecrent.$str.$clientSecrent;
        $signature = strtoupper(md5($str));
        return $signature;
    }
}