Use PaymentCard instead of CreditCard

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

sample/payments/CreatePayment.php

@@ -10,19 +10,19 @@
 
 require __DIR__ . '/../bootstrap.php';
 use PayPal\Api\Amount;
-use PayPal\Api\CreditCard;
 use PayPal\Api\Details;
 use PayPal\Api\FundingInstrument;
 use PayPal\Api\Item;
 use PayPal\Api\ItemList;
 use PayPal\Api\Payer;
 use PayPal\Api\Payment;
+use PayPal\Api\PaymentCard;
 use PayPal\Api\Transaction;
 
-// ### CreditCard
-// A resource representing a credit card that can be
+// ### PaymentCard
+// A resource representing a payment card that can be
 // used to fund a payment.
-$card = new CreditCard();
+$card = new PaymentCard();
 $card->setType("visa")
     ->setNumber("4669424246660779")
     ->setExpireMonth("11")
@@ -36,7 +36,7 @@ $card->setType("visa")
 // For direct credit card payments, set the CreditCard
 // field on this object.
 $fi = new FundingInstrument();
-$fi->setCreditCard($card);
+$fi->setPaymentCard($card);
 
 // ### Payer
 // A resource representing a Payer that funds a payment