Updated Payment APIs

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

lib/PayPal/Api/Measurement.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace PayPal\Api;
+
+use PayPal\Common\PayPalModel;
+
+/**
+ * Class Measurement
+ *
+ * Measurement to represent item dimensions like length, width, height and weight etc.
+ *
+ * @package PayPal\Api
+ *
+ * @property string value
+ * @property string unit
+ */
+class Measurement extends PayPalModel
+{
+    /**
+     * Value this measurement represents.
+     *
+     * @param string $value
+     * 
+     * @return $this
+     */
+    public function setValue($value)
+    {
+        $this->value = $value;
+        return $this;
+    }
+
+    /**
+     * Value this measurement represents.
+     *
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Unit in which the value is represented.
+     *
+     * @param string $unit
+     * 
+     * @return $this
+     */
+    public function setUnit($unit)
+    {
+        $this->unit = $unit;
+        return $this;
+    }
+
+    /**
+     * Unit in which the value is represented.
+     *
+     * @return string
+     */
+    public function getUnit()
+    {
+        return $this->unit;
+    }
+
+}