Braintree\Gateway::creditCard PHP Method

    public function creditCard()
    {
        return new CreditCardGateway($this);
    }

 public function testGatewayCreate()
 {
     $customer = Braintree\Customer::createNoValidate();
     $gateway = new Braintree\Gateway(array('environment' => 'development', 'merchantId' => 'integration_merchant_id', 'publicKey' => 'integration_public_key', 'privateKey' => 'integration_private_key'));
     $result = $gateway->creditCard()->create(array('customerId' => $customer->id, 'cardholderName' => 'Cardholder', 'number' => '5105105105105100', 'expirationDate' => '05/12'));
     $this->assertTrue($result->success);
     $this->assertEquals($customer->id, $result->creditCard->customerId);
     $this->assertEquals('510510', $result->creditCard->bin);
     $this->assertEquals('5100', $result->creditCard->last4);
     $this->assertEquals('Cardholder', $result->creditCard->cardholderName);
     $this->assertEquals('05/2012', $result->creditCard->expirationDate);
 }