Removed Deprecated Getter and Setters

- Removed Deprecated Getter Setters from all Model Classes
- All Camelcase getters and setters are removed. Please use first letter uppercase syntax
- E.g. instead of using get_notify_url(), use getNotifyUrl() instead

lib/PayPal/Api/OpenIdError.php

@@ -13,6 +13,7 @@ class OpenIdError extends PayPalModel
      * A single ASCII error code from the following enum.
      *
      * @param string $error
+     * @return self
      */
     public function setError($error)
     {
@@ -34,6 +35,7 @@ class OpenIdError extends PayPalModel
      * A resource ID that indicates the starting resource in the returned results.
      *
      * @param string $error_description
+     * @return self
      */
     public function setErrorDescription($error_description)
     {
@@ -55,6 +57,7 @@ class OpenIdError extends PayPalModel
      * A URI identifying a human-readable web page with information about the error, used to provide the client developer with additional information about the error.
      *
      * @param string $error_uri
+     * @return self
      */
     public function setErrorUri($error_uri)
     {