diff --git a/src/Fedex/Rate.php b/src/Fedex/Rate.php
index bc4ba01..33fda6f 100644
--- a/src/Fedex/Rate.php
+++ b/src/Fedex/Rate.php
@@ -7,6 +7,7 @@ use pdt256\Shipping\Arr;
 use pdt256\Shipping\Quote;
 use pdt256\Shipping\RateAdapter;
 use pdt256\Shipping\RateRequest;
+use pdt256\Shipping\Validator;
 use DOMDocument;
 use Exception;
 
@@ -15,10 +16,10 @@ class Rate extends RateAdapter
     private $urlDev = 'https://gatewaybeta.fedex.com/web-services/';
     private $urlProd = 'https://gateway.fedex.com/web-services/';
 
-    private $key = 'XXX';
-    private $password = 'XXX';
-    private $accountNumber = 'XXX';
-    private $meterNumber = 'XXX';
+    private $key;
+    private $password;
+    private $accountNumber;
+    private $meterNumber;
     private $dropOffType = 'BUSINESS_SERVICE_CENTER';
 
     public $approvedCodes = [
@@ -66,7 +67,26 @@ class Rate extends RateAdapter
 
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Post()));
     }
+    protected function validate()
+    {
+        foreach ($this->shipment->getPackages() as $package) {
+            Validator::checkIfNull($package->getWeight(), 'weight');
+            Validator::checkIfNull($package->getLength(), 'length');
+            Validator::checkIfNull($package->getHeight(), 'height');
+        }
+        Validator::checkIfNull($this->key, 'key');
+        Validator::checkIfNull($this->password, 'password');
+        Validator::checkIfNull($this->accountNumber, 'accountNumber');
+        Validator::checkIfNull($this->meterNumber, 'meterNumber');
+        Validator::checkIfNull($this->shipment->getFromPostalCode(), 'fromPostalCode');
+        Validator::checkIfNull($this->shipment->getFromCountryCode(), 'fromCountryCode');
+        Validator::checkIfNull($this->shipment->getFromIsResidential(), 'fromIsResidential');
+        Validator::checkIfNull($this->shipment->getToPostalCode(), 'toPostalCode');
+        Validator::checkIfNull($this->shipment->getToCountryCode(), 'toCountryCode');
+        Validator::checkIfNull($this->shipment->getToIsResidential(), 'toIsResidential');
 
+        return $this;
+    }
     protected function prepare()
     {
         $date = time();
@@ -103,7 +123,6 @@ class Rate extends RateAdapter
                     '</Dimensions>' .
                 '</RequestedPackageLineItems>';
         }
-
         $this->data = '<?xml version="1.0"?>' .
             '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" ' .
                 'xmlns="http://fedex.com/ws/rate/v13">' .
diff --git a/src/RateAdapter.php b/src/RateAdapter.php
index 0a334cd..b4b5995 100644
--- a/src/RateAdapter.php
+++ b/src/RateAdapter.php
@@ -16,6 +16,10 @@ abstract class RateAdapter
     /** @var  @var RateRequest\Adapter */
     protected $rateRequest;
 
+    /**
+     * Make sure all necessary fields are set
+     */
+    abstract protected function validate();
     /**
      * Prepare XML
      */
@@ -47,6 +51,7 @@ abstract class RateAdapter
     public function getRates()
     {
         $this
+            ->validate()
             ->prepare()
             ->execute()
             ->process()
diff --git a/src/UPS/Rate.php b/src/UPS/Rate.php
index b3e68cd..a366688 100644
--- a/src/UPS/Rate.php
+++ b/src/UPS/Rate.php
@@ -5,6 +5,7 @@ use pdt256\Shipping\Arr;
 use pdt256\Shipping\Quote;
 use pdt256\Shipping\RateAdapter;
 use pdt256\Shipping\RateRequest;
+use pdt256\Shipping\Validator;
 use DOMDocument;
 use Exception;
 
@@ -13,10 +14,10 @@ class Rate extends RateAdapter
     private $urlDev = 'https://wwwcie.ups.com/ups.app/xml/Rate';
     private $urlProd = 'https://www.ups.com/ups.app/xml/Rate';
 
-    private $accessKey = 'XXX';
-    private $userId = 'XXX';
-    private $password = 'XXX';
-    private $shipperNumber = 'XXX';
+    private $accessKey;
+    private $userId;
+    private $password;
+    private $shipperNumber;
 
     public $approvedCodes = [
         '03',
@@ -94,7 +95,26 @@ class Rate extends RateAdapter
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Post()));
 
     }
+    protected function validate()
+    {
+        foreach ($this->shipment->getPackages() as $package) {
+            Validator::checkIfNull($package->getWeight(), 'weight');
+            Validator::checkIfNull($package->getLength(), 'length');
+            Validator::checkIfNull($package->getHeight(), 'height');
+        }
+        Validator::checkIfNull($this->accessKey, 'accessKey');
+        Validator::checkIfNull($this->userId, 'userId');
+        Validator::checkIfNull($this->password, 'password');
+        Validator::checkIfNull($this->shipperNumber, 'shipperNumber');
+        Validator::checkIfNull($this->shipment->getFromPostalCode(), 'fromPostalCode');
+        Validator::checkIfNull($this->shipment->getFromCountryCode(), 'fromCountryCode');
+        Validator::checkIfNull($this->shipment->getFromIsResidential(), 'fromIsResidential');
+        Validator::checkIfNull($this->shipment->getToPostalCode(), 'toPostalCode');
+        Validator::checkIfNull($this->shipment->getToCountryCode(), 'toCountryCode');
+        Validator::checkIfNull($this->shipment->getToIsResidential(), 'toIsResidential');
 
+        return $this;
+    }
     protected function prepare()
     {
         $service_code = '03';
diff --git a/src/USPS/Rate.php b/src/USPS/Rate.php
index f5e4887..91e44bf 100644
--- a/src/USPS/Rate.php
+++ b/src/USPS/Rate.php
@@ -6,6 +6,7 @@ use pdt256\Shipping\Arr;
 use pdt256\Shipping\Quote;
 use pdt256\Shipping\RateAdapter;
 use pdt256\Shipping\RateRequest;
+use pdt256\Shipping\Validator;
 use DOMDocument;
 use Exception;
 
@@ -14,8 +15,8 @@ class Rate extends RateAdapter
     private $urlDev = 'http://production.shippingapis.com/ShippingAPI.dll';
     private $urlProd = 'http://production.shippingapis.com/ShippingAPI.dll';
 
-    private $username = 'XXX';
-    private $password = 'XXX';
+    private $username;
+    private $password;
 
     public $approvedCodes = [
         '1',
@@ -76,7 +77,20 @@ class Rate extends RateAdapter
         $this->approvedCodes = Arr::get($options, 'approvedCodes');
         $this->setRequestAdapter(Arr::get($options, 'requestAdapter', new RateRequest\Get()));
     }
+    protected function validate()
+    {
+        foreach ($this->shipment->getPackages() as $package) {
+            Validator::checkIfNull($package->getWeight(), 'weight');
+            Validator::checkIfNull($package->getLength(), 'length');
+            Validator::checkIfNull($package->getHeight(), 'height');
+        }
+        Validator::checkIfNull($this->username, 'username');
+        Validator::checkIfNull($this->password, 'password');
+        Validator::checkIfNull($this->shipment->getFromPostalCode(), 'fromPostalCode');
+        Validator::checkIfNull($this->shipment->getToPostalCode(), 'toPostalCode');
 
+        return $this;
+    }
     protected function prepare()
     {
         $packages = '';
diff --git a/src/Validator.php b/src/Validator.php
new file mode 100644
index 0000000..ed697f6
--- /dev/null
+++ b/src/Validator.php
@@ -0,0 +1,10 @@
+<?php
+namespace pdt256\Shipping;
+
+class Validator {
+	public static function checkIfNull($value, $name) {
+		if ($value === null) {
+			throw new \LogicException("$name is not set");
+		}
+	}
+}
\ No newline at end of file