Updated Payment APIs

- Updated SDK Models to latest Payment APIs
- Updated Unit Tests

lib/PayPal/Api/CarrierAccountToken.php

@@ -3,8 +3,6 @@
 namespace PayPal\Api;
 
 use PayPal\Common\PayPalModel;
-use PayPal\Rest\ApiContext;
-
 
 /**
  * Class CarrierAccountToken
@@ -20,9 +18,9 @@ class CarrierAccountToken extends PayPalModel
 {
     /**
      * ID of a previously saved carrier account resource.
-     * 
      *
      * @param string $carrier_account_id
+     *
      * @return $this
      */
     public function setCarrierAccountId($carrier_account_id)
@@ -42,8 +40,8 @@ class CarrierAccountToken extends PayPalModel
     }
 
     /**
-     * The unique identifier of the payer used when saving this carrier account instrument.
-     * 
+     * ID of a previously saved carrier account resource.
+     *
      *
      * @param string $external_customer_id
      * @return $this