Use PaymentCard instead of CreditCard

- Fixed deprecation messages.
- Fixes #639.
- Fixes #648.
- Updated Samples.

sample/billing/CreateBillingAgreementWithCreditCard.php

@@ -12,10 +12,10 @@
 $createdPlan = require 'UpdatePlan.php';
 
 use PayPal\Api\Agreement;
-use PayPal\Api\CreditCard;
 use PayPal\Api\FundingInstrument;
 use PayPal\Api\Payer;
 use PayPal\Api\PayerInfo;
+use PayPal\Api\PaymentCard;
 use PayPal\Api\Plan;
 use PayPal\Api\ShippingAddress;
 
@@ -70,15 +70,15 @@ $payer->setPaymentMethod('credit_card')
     ->setPayerInfo(new PayerInfo(array('email' => 'jaypatel512-facilitator@hotmail.com')));
 
 // Add Credit Card to Funding Instruments
-$creditCard = new CreditCard();
-$creditCard->setType('visa')
+$paymentCard = new PaymentCard();
+$paymentCard->setType('visa')
     ->setNumber('4491759698858890')
     ->setExpireMonth('12')
     ->setExpireYear('2017')
     ->setCvv2('128');
 
 $fundingInstrument = new FundingInstrument();
-$fundingInstrument->setCreditCard($creditCard);
+$fundingInstrument->setPaymentCard($paymentCard);
 $payer->setFundingInstruments(array($fundingInstrument));
 //Add Payer to Agreement
 $agreement->setPayer($payer);