diff --git a/packages/Webkul/Checkout/src/Cart.php b/packages/Webkul/Checkout/src/Cart.php
index 0c0736029..d5cb8f504 100755
--- a/packages/Webkul/Checkout/src/Cart.php
+++ b/packages/Webkul/Checkout/src/Cart.php
@@ -446,7 +446,7 @@ class Cart
             return false;
         }
 
-        if (! array_key_exists($shippingMethodCode, Shipping::getShippingMethods())) {
+        if (! Shipping::isMethodCodeExists($shippingMethodCode)) {
             return false;
         }
 
diff --git a/packages/Webkul/Shipping/src/Carriers/AbstractShipping.php b/packages/Webkul/Shipping/src/Carriers/AbstractShipping.php
index 1886f6409..506bb209e 100755
--- a/packages/Webkul/Shipping/src/Carriers/AbstractShipping.php
+++ b/packages/Webkul/Shipping/src/Carriers/AbstractShipping.php
@@ -2,17 +2,19 @@
 
 namespace Webkul\Shipping\Carriers;
 
+use Webkul\Shipping\Exceptions\CarrierCodeException;
+
 abstract class AbstractShipping
 {
     /**
-     * Shipping method carrier code
+     * Shipping method carrier code.
      *
      * @var string
      */
     protected $code;
 
     /**
-     * Shipping method code
+     * Shipping method code.
      *
      * @var string
      */
@@ -21,7 +23,7 @@ abstract class AbstractShipping
     abstract public function calculate();
 
     /**
-     * Checks if shipping method is available
+     * Checks if shipping method is available.
      *
      * @return array
      */
@@ -31,30 +33,37 @@ abstract class AbstractShipping
     }
 
     /**
-     * Returns shipping method code
+     * Returns shipping method carrier code.
      *
-     * @return array
+     * @return string
      */
     public function getCode()
     {
         if (empty($this->code)) {
-            // throw exception
+            throw new CarrierCodeException('Carrier code should be initialized.');
         }
 
         return $this->code;
     }
 
+    /**
+     * Return shipping method code.
+     *
+     * @return string
+     */
     public function getMethod()
     {
         if (empty($this->method)) {
-            // throw exception
+            $code = $this->getCode();
+
+            return $code . '_' . $code;
         }
 
         return $this->method;
     }
 
     /**
-     * Returns shipping method title
+     * Returns shipping method title.
      *
      * @return array
      */
@@ -64,7 +73,7 @@ abstract class AbstractShipping
     }
 
     /**
-     * Returns shipping method description
+     * Returns shipping method description.
      *
      * @return array
      */
@@ -74,9 +83,9 @@ abstract class AbstractShipping
     }
 
     /**
-     * Retrieve information from shipping configuration
+     * Retrieve information from shipping configuration.
      *
-     * @param string $field
+     * @param  string  $field
      * @return mixed
      */
     public function getConfigData($field)
diff --git a/packages/Webkul/Shipping/src/Carriers/FlatRate.php b/packages/Webkul/Shipping/src/Carriers/FlatRate.php
index 4e2a5e20e..c189138a8 100755
--- a/packages/Webkul/Shipping/src/Carriers/FlatRate.php
+++ b/packages/Webkul/Shipping/src/Carriers/FlatRate.php
@@ -2,35 +2,29 @@
 
 namespace Webkul\Shipping\Carriers;
 
-use Config;
-use Webkul\Checkout\Models\CartShippingRate;
-use Webkul\Shipping\Facades\Shipping;
 use Webkul\Checkout\Facades\Cart;
+use Webkul\Checkout\Models\CartShippingRate;
 
-/**
- * Class Rate.
- *
- */
 class FlatRate extends AbstractShipping
 {
     /**
-     * Shipping method carrier code
+     * Shipping method carrier code.
      *
      * @var string
      */
     protected $code = 'flatrate';
 
     /**
-     * Shipping method code
+     * Shipping method code.
      *
      * @var string
      */
     protected $method = 'flatrate_flatrate';
 
     /**
-     * Returns rate for flatrate
+     * Calculate rate for flatrate.
      *
-     * @return CartShippingRate|false
+     * @return \Webkul\Checkout\Models\CartShippingRate|false
      */
     public function calculate()
     {
@@ -38,31 +32,41 @@ class FlatRate extends AbstractShipping
             return false;
         }
 
+        return $this->getRate();
+    }
+
+    /**
+     * Get rate.
+     *
+     * @return \Webkul\Checkout\Models\CartShippingRate
+     */
+    public function getRate(): \Webkul\Checkout\Models\CartShippingRate
+    {
         $cart = Cart::getCart();
 
-        $object = new CartShippingRate;
+        $cartShippingRate = new CartShippingRate;
 
-        $object->carrier = 'flatrate';
-        $object->carrier_title = $this->getConfigData('title');
-        $object->method = $this->method;
-        $object->method_title = $this->getConfigData('title');
-        $object->method_description = $this->getConfigData('description');
-        $object->is_calculate_tax = $this->getConfigData('is_calculate_tax');
-        $object->price = 0;
-        $object->base_price = 0;
+        $cartShippingRate->carrier = $this->getCode();
+        $cartShippingRate->carrier_title = $this->getConfigData('title');
+        $cartShippingRate->method = $this->getMethod();
+        $cartShippingRate->method_title = $this->getConfigData('title');
+        $cartShippingRate->method_description = $this->getConfigData('description');
+        $cartShippingRate->is_calculate_tax = $this->getConfigData('is_calculate_tax');
+        $cartShippingRate->price = 0;
+        $cartShippingRate->base_price = 0;
 
         if ($this->getConfigData('type') == 'per_unit') {
             foreach ($cart->items as $item) {
                 if ($item->product->getTypeInstance()->isStockable()) {
-                    $object->price += core()->convertPrice($this->getConfigData('default_rate')) * $item->quantity;
-                    $object->base_price += $this->getConfigData('default_rate') * $item->quantity;
+                    $cartShippingRate->price += core()->convertPrice($this->getConfigData('default_rate')) * $item->quantity;
+                    $cartShippingRate->base_price += $this->getConfigData('default_rate') * $item->quantity;
                 }
             }
         } else {
-            $object->price = core()->convertPrice($this->getConfigData('default_rate'));
-            $object->base_price = $this->getConfigData('default_rate');
+            $cartShippingRate->price = core()->convertPrice($this->getConfigData('default_rate'));
+            $cartShippingRate->base_price = $this->getConfigData('default_rate');
         }
 
-        return $object;
+        return $cartShippingRate;
     }
-}
\ No newline at end of file
+}
diff --git a/packages/Webkul/Shipping/src/Carriers/Free.php b/packages/Webkul/Shipping/src/Carriers/Free.php
index 7704d5bf6..8115da105 100755
--- a/packages/Webkul/Shipping/src/Carriers/Free.php
+++ b/packages/Webkul/Shipping/src/Carriers/Free.php
@@ -2,32 +2,26 @@
 
 namespace Webkul\Shipping\Carriers;
 
-use Config;
 use Webkul\Checkout\Models\CartShippingRate;
-use Webkul\Shipping\Facades\Shipping;
 
-/**
- * Class Rate.
- *
- */
 class Free extends AbstractShipping
 {
     /**
-     * Shipping method carrier code
+     * Shipping method carrier code.
      *
      * @var string
      */
     protected $code = 'free';
 
     /**
-     * Shipping method code
+     * Shipping method code.
      *
      * @var string
      */
     protected $method = 'free_free';
 
     /**
-     * Returns rate for flatrate
+     * Calculate rate for free shipping.
      *
      * @return CartShippingRate|false
      */
@@ -37,17 +31,27 @@ class Free extends AbstractShipping
             return false;
         }
 
-        $object = new CartShippingRate;
-
-        $object->carrier = 'free';
-        $object->carrier_title = $this->getConfigData('title');
-        $object->method = 'free_free';
-        $object->method_title = $this->getConfigData('title');
-        $object->method_description = $this->getConfigData('description');
-        $object->is_calculate_tax = $this->getConfigData('is_calculate_tax');
-        $object->price = 0;
-        $object->base_price = 0;
-
-        return $object;
+        return $this->getRate();
     }
-}
\ No newline at end of file
+
+    /**
+     * Get rate.
+     *
+     * @return \Webkul\Checkout\Models\CartShippingRate
+     */
+    public function getRate(): \Webkul\Checkout\Models\CartShippingRate
+    {
+        $cartShippingRate = new CartShippingRate;
+
+        $cartShippingRate->carrier = $this->getCode();
+        $cartShippingRate->carrier_title = $this->getConfigData('title');
+        $cartShippingRate->method = $this->getMethod();
+        $cartShippingRate->method_title = $this->getConfigData('title');
+        $cartShippingRate->method_description = $this->getConfigData('description');
+        $cartShippingRate->is_calculate_tax = $this->getConfigData('is_calculate_tax');
+        $cartShippingRate->price = 0;
+        $cartShippingRate->base_price = 0;
+
+        return $cartShippingRate;
+    }
+}
diff --git a/packages/Webkul/Shipping/src/Config/carriers.php b/packages/Webkul/Shipping/src/Config/carriers.php
index fd870fa61..f5422100b 100755
--- a/packages/Webkul/Shipping/src/Config/carriers.php
+++ b/packages/Webkul/Shipping/src/Config/carriers.php
@@ -21,4 +21,4 @@ return [
         'default_rate'     => '0',
         'class'            => 'Webkul\Shipping\Carriers\Free',
     ]
-];
\ No newline at end of file
+];
diff --git a/packages/Webkul/Shipping/src/Exceptions/CarrierCodeException.php b/packages/Webkul/Shipping/src/Exceptions/CarrierCodeException.php
new file mode 100755
index 000000000..217f8c663
--- /dev/null
+++ b/packages/Webkul/Shipping/src/Exceptions/CarrierCodeException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Webkul\Shipping\Exceptions;
+
+use Exception;
+
+class CarrierCodeException extends Exception
+{
+}
diff --git a/packages/Webkul/Shipping/src/Shipping.php b/packages/Webkul/Shipping/src/Shipping.php
index aaac7e124..f9013e8bf 100755
--- a/packages/Webkul/Shipping/src/Shipping.php
+++ b/packages/Webkul/Shipping/src/Shipping.php
@@ -5,21 +5,17 @@ namespace Webkul\Shipping;
 use Illuminate\Support\Facades\Config;
 use Webkul\Checkout\Facades\Cart;
 
-/**
- * Class Shipping.
- *
- */
 class Shipping
 {
     /**
-     * Rates
+     * Rates.
      *
      * @var array
      */
     protected $rates = [];
 
     /**
-     * Collects rate from available shipping methods
+     * Collects rate from available shipping methods.
      *
      * @return array
      */
@@ -53,7 +49,7 @@ class Shipping
     }
 
     /**
-     * Persist shipping rate to database
+     * Remove all shipping rates.
      *
      * @return void
      */
@@ -69,7 +65,7 @@ class Shipping
     }
 
     /**
-     * Persist shipping rate to database
+     * Save all shipping rates.
      *
      * @return void
      */
@@ -92,7 +88,7 @@ class Shipping
     }
 
     /**
-     * Returns shipping rates, grouped by shipping method
+     * Returns shipping rates, grouped by shipping method.
      *
      * @return void
      */
@@ -115,7 +111,7 @@ class Shipping
     }
 
     /**
-     * Returns active shipping methods
+     * Returns active shipping methods.
      *
      * @return array
      */
@@ -130,7 +126,7 @@ class Shipping
                 continue;
             }
 
-            $methods[$object->getMethod()] = [
+            $methods[] = [
                 'code'         => $object->getCode(),
                 'method'       => $object->getMethod(),
                 'method_title' => $object->getTitle(),
@@ -140,4 +136,17 @@ class Shipping
 
         return $methods;
     }
-}
\ No newline at end of file
+
+    /**
+     * Is method exist in active shipping methods.
+     *
+     * @param  string  $shippingMethodCode
+     * @return boolean
+     */
+    public function isMethodCodeExists($shippingMethodCode)
+    {
+        $activeShippingMethods = collect($this->getShippingMethods());
+
+        return $activeShippingMethods->contains('method', $shippingMethodCode);
+    }
+}