back button implemented on checkout page

packages/Webkul/Shop/src/Resources/lang/en/app.php

@@ -433,7 +433,8 @@ return [
             'contact' => 'Contact',
             'place-order' => 'Place Order',
             'new-address' => 'Add New Address',
-            'save_as_address' => 'Save as Address'
+            'save_as_address' => 'Save as Address',
+            'back' => 'Back'
         ],
 
         'total' => [

packages/Webkul/Shop/src/Resources/views/checkout/onepage.blade.php

@@ -364,7 +364,15 @@
 
                 newShippingAddress: function() {
                     this.new_shipping_address = true;
-                }
+                },
+
+                backToSavedBillingAddress: function() {
+                    this.new_billing_address = false;
+                },
+
+                backToSavedShippingAddress: function() {
+                    this.new_shipping_address = false;
+                },
             }
         })
 

packages/Webkul/Shop/src/Resources/views/checkout/onepage/customer-info.blade.php

@@ -69,6 +69,12 @@
                     {{ __('shop::app.checkout.onepage.sign-in') }}
                 </a>
             @endguest
+
+            @auth('customer')
+                <a class="btn btn-lg btn-primary" @click = backToSavedBillingAddress()>
+                    {{ __('shop::app.checkout.onepage.back') }}
+                </a>
+            @endauth
         </div>
 
         <div class="control-group" :class="[errors.has('address-form.billing[first_name]') ? 'has-error' : '']">
@@ -285,6 +291,12 @@
 
         <div class="form-header">
             <h1>{{ __('shop::app.checkout.onepage.shipping-address') }}</h1>
+
+            @auth('customer')
+                <a class="btn btn-lg btn-primary" @click = backToSavedShippingAddress()>
+                    {{ __('shop::app.checkout.onepage.back') }}
+                </a>
+            @endauth
         </div>
 
         <div class="control-group" :class="[errors.has('address-form.shipping[first_name]') ? 'has-error' : '']">