diff --git a/src/Fedex/Rate.php b/src/Fedex/Rate.php
index 33fda6f..82f8dad 100644
--- a/src/Fedex/Rate.php
+++ b/src/Fedex/Rate.php
@@ -20,15 +20,14 @@ class Rate extends RateAdapter
     private $password;
     private $accountNumber;
     private $meterNumber;
-    private $dropOffType = 'BUSINESS_SERVICE_CENTER';
-
-    public $approvedCodes = [
-        'PRIORITY_OVERNIGHT',
-        'FEDEX_2_DAY',
-        'FEDEX_EXPRESS_SAVER',
-        'FEDEX_GROUND',
-        'GROUND_HOME_DELIVERY',
-    ];
+    /**
+     * Type of Drop off, default value "BUSINESS_SERVICE_CENTER" is defined in __construct if not specified.
+     */
+    private $dropOffType;
+    /**
+     * Codes of appropriate shipping types. Default value is specified in __construct.
+     */
+    public $approvedCodes;
 
     private $shippingCodes = [
         'EUROPE_FIRST_INTERNATIONAL_PRIORITY' => 'Europe First International Priority',
@@ -62,8 +61,14 @@ class Rate extends RateAdapter
         $this->password      = Arr::get($options, 'password');
         $this->accountNumber = Arr::get($options, 'accountNumber');
         $this->meterNumber   = Arr::get($options, 'meterNumber');
-        $this->approvedCodes = Arr::get($options, 'approvedCodes');
-        $this->dropOffType   = Arr::get($options, 'dropOffType');
+        $this->approvedCodes = Arr::get($options, 'approvedCodes', [
+            'PRIORITY_OVERNIGHT',
+            'FEDEX_2_DAY',
+            'FEDEX_EXPRESS_SAVER',
+            'FEDEX_GROUND',
+            'GROUND_HOME_DELIVERY',
+        ]);
+        $this->dropOffType   = Arr::get($options, 'dropOffType', 'BUSINESS_SERVICE_CENTER');
 
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Post()));
     }
diff --git a/src/UPS/Rate.php b/src/UPS/Rate.php
index a366688..cfc3170 100644
--- a/src/UPS/Rate.php
+++ b/src/UPS/Rate.php
@@ -18,11 +18,10 @@ class Rate extends RateAdapter
     private $userId;
     private $password;
     private $shipperNumber;
-
-    public $approvedCodes = [
-        '03',
-        '12',
-    ];
+    /**
+     * Codes of appropriate shipping types. Default value is specified in __construct.
+     */
+    public $approvedCodes;
 
     private $shippingCodes = [
         'US' => [ // United States
@@ -90,7 +89,10 @@ class Rate extends RateAdapter
         $this->userId        = Arr::get($options, 'userId');
         $this->password      = Arr::get($options, 'password');
         $this->shipperNumber = Arr::get($options, 'shipperNumber');
-        $this->approvedCodes = Arr::get($options, 'approvedCodes');
+        $this->approvedCodes = Arr::get($options, 'approvedCodes',[
+            '03',
+            '12',
+        ]);
 
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Post()));
 
diff --git a/src/USPS/Rate.php b/src/USPS/Rate.php
index 91e44bf..2ade0ec 100644
--- a/src/USPS/Rate.php
+++ b/src/USPS/Rate.php
@@ -17,11 +17,10 @@ class Rate extends RateAdapter
 
     private $username;
     private $password;
-
-    public $approvedCodes = [
-        '1',
-        '4',
-    ];
+    /**
+     * Codes of appropriate shipping types. Default value is specified in __construct.
+     */
+    public $approvedCodes;
 
     private $shipping_codes = [
         'domestic' => [
@@ -74,7 +73,10 @@ class Rate extends RateAdapter
 
         $this->username = Arr::get($options, 'username');
         $this->password = Arr::get($options, 'password');
-        $this->approvedCodes = Arr::get($options, 'approvedCodes');
+        $this->approvedCodes = Arr::get($options, 'approvedCodes', [
+            '1',
+            '4',
+        ]);
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Get()));
     }
     protected function validate()