在paypal交易完成后，为什么余额不会改变

I'm using "Omnipay integration with PayPal Express Checkout [symfony2.5]" and this the implimentation for the class

namespace Atcop\BookBundle\Libs;

use Omnipay\Common\GatewayFactory;

class Paypal {

protected $gateway = null;
private static $CURRENCY = "USD";

public function __construct() {

    $this->gateway = GatewayFactory::create('PayPal_Express');
    $this->gateway->setUsername('*********');
    $this->gateway->setPassword('**********');
    $this->gateway->setSignature('**************');
    $this->gateway->setTestMode(true);
}
public function sendPurchase($parameters = []){

    $payArray = [
        'amount' => 58.00,
        'description' => $parameters['description'],
        'currency' => self::$CURRENCY,
        'transactionId' => $parameters['transactionId'],
        'returnUrl' => $parameters['returnUrl'],
        'cancelUrl' => $parameters['cancelUrl']
    ];

    return $this->gateway->purchase($payArray)->send();
}

public function complete($reference, $payerId) {

    $completePayData = [
        'amount' => 58.00,
        'description' => 'Buy the currencies book - step by step',
        'transactionReference' => $reference,
        'payerId' => $payerId,
    ];

    $response = $this->gateway->completePurchase($completePayData)->send();
    if($response->isSuccessful()){
        return $response->getData();
    }
    return false;
}

}

Everything is ok after completing and i see the notifications and the receipt for that transaction in the dashboard but the balance doesn't change in merchant and buyer ???!!!

It solved the balance doesn't change on test mode, when converted to live mode every things were ok.