Help with changing php web script purchasing dollars to credit units

[chrisj]

I’m looking for some assistance with modifying an existing php video web site script, so that the User can buy credits, to use for purchases, on the site. The script currently allows Users to replenish their User Account “Wallet” (via Paypal) and use money (not credits) to purchase video viewing. I’m wondering how easy it might be to modify the script So, that whatever shows in his ‘Wallet’ is the number of credits, instead of dollars.

In the script’s ‘ajax’ folder are a file named wallet.php and buy-video.php. Any suggestions?

wallet.php:

<?php

if (IS_LOGGED == false) {
    $data = array(
        'status' => 400,
        'error' => 'Not logged in'
    );
    echo json_encode($data);
    exit();
}


use PayPal\Api\Payer;
use PayPal\Api\Item;
use PayPal\Api\ItemList;
use PayPal\Api\Details;
use PayPal\Api\Amount;
use PayPal\Api\Transaction;
use PayPal\Api\RedirectUrls;
use PayPal\Api\Payment;
use PayPal\Api\PaymentExecution;


$payment_currency = $pt->config->payment_currency;
$payer        = new Payer();
$item         = new Item();
$itemList     = new ItemList();
$details      = new Details();
$amount       = new Amount();
$transaction  = new Transaction();
$redirectUrls = new RedirectUrls();
$payment      = new Payment();
$payer->setPaymentMethod('paypal');

if ($first == 'replenish') {
	$data    = array('status' => 400);
	$request = (!empty($_POST['amount']) && is_numeric($_POST['amount']));
	if ($request === true) {
		$rep_amount  = $_POST['amount'];
		$redirectUrl = PT_Link("aj/wallet/get_paid?status=success&amount=$rep_amount");
		$redirectUrls->setReturnUrl($redirectUrl)->setCancelUrl(PT_Link(''));    
	    $item->setName('Replenish your balance')->setQuantity(1)->setPrice($rep_amount)->setCurrency($payment_currency);  
	    $itemList->setItems(array($item));    
	    $details->setSubtotal($rep_amount);
	    $amount->setCurrency($payment_currency)->setTotal($rep_amount)->setDetails($details);
	    $transaction->setAmount($amount)->setItemList($itemList)->setDescription('Replenish your balance')->setInvoiceNumber(time());
	    $payment->setIntent('sale')->setPayer($payer)->setRedirectUrls($redirectUrls)->setTransactions(array(
	        $transaction
	    ));

	    try {
	        $payment->create($paypal);
	    }

	    catch (Exception $e) {
	        $data = array(
	            'type' => 'ERROR',
	            'details' => json_decode($e->getData())
	        );

	        if (empty($data['details'])) {
	            $data['details'] = json_decode($e->getCode());
	        }
	        echo json_encode($data);
	    	exit();
	    }

	    $data = array(
	        'status' => 200,
	        'type' => 'SUCCESS',
	        'url' => $payment->getApprovalLink()
	    );

	}
}

if ($first == 'get_paid') {
	$data['status'] = 500;
	$request        = (
		!empty($_GET['paymentId']) && 
		!empty($_GET['PayerID']) && 
		!empty($_GET['status']) && 
		!empty($_GET['amount']) && 
		is_numeric($_GET['amount']) && 
		$_GET['status'] == 'success'
	);

	if ($request === true) {

		$paymentId = PT_Secure($_GET['paymentId']);
		$PayerID   = PT_Secure($_GET['PayerID']);
		$payment   = Payment::get($paymentId, $paypal);
	    $execute   = new PaymentExecution();
	    $execute->setPayerId($PayerID);

	    try{
	        $result = $payment->execute($execute, $paypal);
	    }

	    catch (Exception $e) {
	        $data = array(
	            'type' => 'ERROR',
	            'details' => json_decode($e->getData())
	        );

	        if (empty($data['details'])) {
	            $data['details'] = json_decode($e->getCode());
	        }

	        echo json_encode($data);
	    	exit();
	    }

		$amount  = $_GET['amount'];
		$update  = array('wallet' => ($user->wallet += $amount));
		$db->where('id',$user->id)->update(T_USERS,$update);
		$_SESSION['upgraded'] = true;
		$url     = PT_Link('ads');
    	header("Location: $url");
    	exit();

	}
}

buy-video.php:

<?php
if (IS_LOGGED == false) {
    $data = array('status' => 400, 'error' => 'Not logged in');
    echo json_encode($data);
    exit();
}

if (!empty($_POST['id'])) {
    
    if (!is_array($_POST['id'])) {
        $id_array[] = $_POST['id'];
    } else {
        $id_array = $_POST['id'];
    }
    
    // get cost video
    $db->where('name', 'video_play_price');
    $db_cost = $db->getOne('config');
    $video_cost = (float)$db_cost->value;
    
    $count_video = count($id_array);
    $user_id = $user->id;
    $wallet = (float)str_replace(',', '', $user->wallet);
    $amout = $video_cost * $count_video;
    
    if ($wallet >= $amout) {
        
        $new_wallet = (string)($wallet - $amout);
        
        $db->startTransaction();
    
        $inserted_records = 0;
        foreach ($id_array as $id) {
            $video_id = (int)PT_Secure($id);
            
            // get video data
            $video = $db->where('id', $id)->getOne(T_VIDEOS);
            
            
            // add data to paid table
            $insert_buy = $db->insert('u_paid_videos', [
                'id_user' => $user_id,
                'id_video' => $video_id,
                'session_key' => $_SESSION['session_key'],
                'video_play_price' => (string)$video_cost,
                'video_title' => $video->title,
                'user_id_uploaded' => $video->user_id,
            ]);
            
            if ($insert_buy) { $inserted_records++; }
        }
        
        $db->where('id', $user_id);
        $update_wallet = $db->update(T_USERS, [
            'wallet' => $new_wallet,
        ]);
        
        
        if (($inserted_records == $count_video) && $update_wallet) {
            $db->commit();
            
            echo json_encode([
                'status' => 200
            ]);
            exit();
        } else {
            $db->rollback();
            
            echo json_encode([
                'status' => 400,
                'error' => 'Buy process error'
            ]);
            exit();
        }
        
    } else {
        
        echo json_encode([
            'status' => 400,
            'error_num' => 1,
            'error' => 'Not enough money'
        ]);
        exit();
        
    }
    
} else {
    
    echo json_encode([
        'status' => 400,
        'error' => 'Bad Request, Invalid or missing parameter'
    ]);
    exit();
    
}