require 'vendor/autoload.php';

    

    use AvalanchePay\Api\Payer;
    use AvalanchePay\Api\Amount;
    use AvalanchePay\Api\Transaction;
    use AvalanchePay\Api\RedirectUrls;
    use AvalanchePay\Api\Payment;

    //Payer Object
    $payer = new Payer();
    $payer->setPaymentMethod('Default'); //Leave as default if you don't know which payment method to use

    //Amount Object
    $amountIns = new Amount();
    $amountIns->setTotal(20)->setCurrency('USD'); //must give a valid currency code and must exist in merchant wallet list

    //Transaction Object
    $trans = new Transaction();
    $trans->setAmount($amountIns);

    //RedirectUrls Object
    $urls = new RedirectUrls();
    $urls->setSuccessUrl('http://your-merchant-domain.com/example-success.php') //success url - the merchant domain page,
    to redirect after successful payment, see sample example-success.php file in sdk root
    ->setCancelUrl('http://your-merchant-domain.com/'); //cancel url - the merchant domain page, to redirect after
    cancellation of payment

    //Payment Object
    $payment = new Payment();
    $payment->setCredentials([ //client id & client secret, see merchants->setting(gear icon)
    'client_id' => 'place your client id here', //must provide correct client id of an express merchant
    'client_secret' => 'place your client secret here' //must provide correct client secret of an express merchant
    ])->setRedirectUrls($urls)
    ->setPayer($payer)
    ->setTransaction($trans);

    try {
     $payment->create(); //create payment
     header("Location: ".$payment->getApprovedUrl()); //checkout url
    } catch (\Exception $ex) {
     print $ex;
     exit;
    }