อยากถามการเชื่อมต่อกับ TrueWallet โดยใช้ JAVA (JSON) ทำอย่างไรคับ

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class TrueWalletAPI{
	private $username = '????????';// email or phonenumber
	private $password = '???????';
	private $login_type = 'email';// email or mobile
	private $passhash;
	//Config TrueWallet ห้ามแก้ไขหากไม่รู้ค่าที่แท้จริง
	private $api_signin = "https://api-ewm.truemoney.com/api/v1/signin?&"; 
	private $api_profile = "https://api-ewm.truemoney.com/api/v1/profile/"; 
	private $api_topup = "https://api-ewm.truemoney.com/api/api/v1/topup/mobile/"; 
	private $api_gettran = "https://api-ewm.truemoney.com/api/v1/profile/transactions/history/"; 
	private $api_checktran = "https://api-ewm.truemoney.com/api/v1/profile/activities/"; 
	private $device_os = "android"; 
	private $device_id = "d520d0d12d0d48cb89394905168c6ed5"; 
	private $device_type = "CPH1611"; 
	private $device_version = "6.0.1"; 
	private $app_name = "wallet"; 
	private $app_version = "4.0.1"; 
	private $deviceToken = "fUUbZJ9nwBk:APA91bHHgBBHhP9rqBEon_BtUNz3rLHQ-sYXnezA10PRSWQTwFpMvC9QiFzh-CqPsbWEd6x409ATC5RVsHAfk_-14cSqVdGzhn8iX2K_DiNHvpYfMMIzvFx_YWpYj5OaEzMyIPh3mgtx"; 
	private $mobileTracking = "dJyFzn\/GIq7lrjv2RCsZbphpp0L\/W2+PsOTtOpg352mgWrt4XAEAAA==";
	private $token;
	public $pf;
	public function __construct(){
		$this->passhash = sha1($this->username.$this->password);
		$a = $this->GetToken();
		$j = json_decode($a);
		$this->token = $j->data->accessToken;
		$this->pf = $this->Profile();
	}
	public function GetToken(){
		$url = $this->api_signin.'device_os='.$this->device_os.'&device_id='.$this->device_id.
			'&device_type='.$this->device_type.'&device_version='.$this->device_version.
			'&app_name='.$this->app_name.'&app_version='.$this->app_version;
		$header = array("Host: api-ewm.truemoney.com","Content-Type: application/json");
		$postfield = array(
			"username"=>$this->username,
			"password"=>$this->passhash,
			"type"=>$this->login_type,
			"deviceToken"=>$this->deviceToken,
			"mobileTracking"=>$this->mobileTracking,
		);
		$data_string = json_encode($postfield);
		return $this->wallet_curl($url,$data_string,$header);
	}
	public function Profile(){
		$url = $this->api_profile.$this->token.'?&device_os=android&device_id='.$this->device_id.
			'&device_type='.$this->device_type.'&device_version='.$this->device_version.
			'&app_name='.$this->app_name.'&app_version='.$this->app_version;
		$header = array("Host: api-ewm.truemoney.com");
		$a = $this->wallet_curl($url,false,$header);
		return json_decode($a);
	
	}
	public function Topup($cashcard){
		$url = $this->api_topup.time()."/".$this->token."/cashcard/".$cashcard;
		$header = array("Host: api-ewm.truemoney.com");
		$a = $this->wallet_curl($url,true,$header);
		return json_decode($a);
	}
	public function getTran($start,$end){
		$url = $this->api_gettran.$this->token.'/?startDate='.$start.'&endDate='.$end.'&limit=20&page=1&type=&action=';
		$header = array("Host: api-ewm.truemoney.com");
		$a=$this->wallet_curl($url,false,$header);
		return json_decode($a);
	}
	public function CheckTran($id){
		$url = $this->api_checktran.$id.'/detail/'.$this->token.'?&device_os=android&device_id='.$this->device_id.
			'&device_type='.$this->device_type.'&device_version='.$this->device_version.
			'&app_name='.$this->app_name.'&app_version='.$this->app_version;
		$header = array("Host: api-ewm.truemoney.com");
		$a=$this->wallet_curl($url,false,$header);
		return json_decode($a);
	}
	private function wallet_curl($url,$data,$header){	
		$ch = curl_init();
		curl_setopt($ch,CURLOPT_URL,$url);
		curl_setopt($ch,CURLOPT_HTTPHEADER,$header);
		curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
		curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);  
		if($data){
			curl_setopt($ch,CURLOPT_CUSTOMREQUEST, "POST");                                                                     
			curl_setopt($ch,CURLOPT_POSTFIELDS, $data);         
		}                                  
		curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);   
		curl_setopt($ch,CURLOPT_USERAGENT,'okhttp/3.8.0');
		$result = curl_exec($ch);
		return $result;
	}
}