Omnipay\Alipay\LegacyAppGateway::purchase PHP Метод

    public function purchase(array $parameters = [])
    {
        return $this->createRequest(LegacyAppPurchaseRequest::class, $parameters);
    }

 public function testCreateOrder()
 {
     $partner = '123456789';
     $privateKey = ALIPAY_ASSET_DIR . '/dist/common/rsa_private_key.pem';
     //$partner    = ALIPAY_PARTNER;
     //$privateKey = ALIPAY_ASSET_DIR . '/dist/common/rsa_private_key.pem';
     $this->assertFileExists($privateKey);
     $this->gateway = new LegacyAppGateway($this->getHttpClient(), $this->getHttpRequest());
     $this->gateway->setPartner($partner);
     $this->gateway->setSellerId($partner);
     $this->gateway->setPrivateKey($privateKey);
     $this->gateway->setNotifyUrl('https://www.example.com/notify');
     $this->options = ['out_trade_no' => '2014010122390001', 'subject' => 'test', 'total_fee' => '0.01'];
     /**
      * @var LegacyAppPurchaseResponse $response
      */
     $response = $this->gateway->purchase($this->options)->send();
     $this->assertEquals('e16fdd8098c197201986cd9c3a8fb276', md5($response->getOrderString()));
 }