diff --git a/modules/PaypalStandard/Http/Controllers/Payment.php b/modules/PaypalStandard/Http/Controllers/Payment.php
index af7c6083d..9e85bcd1b 100644
--- a/modules/PaypalStandard/Http/Controllers/Payment.php
+++ b/modules/PaypalStandard/Http/Controllers/Payment.php
@@ -17,15 +17,15 @@ class Payment extends PaymentController
 
     public $type = 'redirect';
 
-    public function show(Document $document, PaymentRequest $request)
+    public function show(Document $invoice, PaymentRequest $request)
     {
         $setting = $this->setting;
 
-        $this->setContactFirstLastName($document);
+        $this->setContactFirstLastName($invoice);
 
         $setting['action'] = ($setting['mode'] == 'live') ? 'https://www.paypal.com/cgi-bin/webscr' : 'https://www.sandbox.paypal.com/cgi-bin/webscr';
 
-        $document_url = $this->getInvoiceUrl($document);
+        $invoice_url = $this->getInvoiceUrl($invoice);
 
         $html = view('paypal-standard::show', compact('setting', 'document', 'document_url'))->render();
 
@@ -38,7 +38,7 @@ class Payment extends PaymentController
         ]);
     }
 
-    public function return(Document $document, Request $request)
+    public function return(Document $invoice, Request $request)
     {
         $success = true;
 
@@ -66,12 +66,12 @@ class Payment extends PaymentController
             flash($message)->warning();
         }
 
-        $document_url = $this->getInvoiceUrl($document);
+        $invoice_url = $this->getInvoiceUrl($invoice);
 
-        return redirect($document_url);
+        return redirect($invoice_url);
     }
 
-    public function complete(Document $document, Request $request)
+    public function complete(Document $invoice, Request $request)
     {
         $setting = $this->setting;
 
@@ -79,7 +79,7 @@ class Payment extends PaymentController
 
         $paypal_log->pushHandler(new StreamHandler(storage_path('logs/paypal.log')), Logger::INFO);
 
-        if (!$document) {
+        if (!$invoice) {
             return;
         }
 
@@ -115,10 +115,10 @@ class Payment extends PaymentController
             case 'Completed':
                 $receiver_match = (strtolower($request['receiver_email']) == strtolower($setting['email']));
 
-                $total_paid_match = ((double) $request['mc_gross'] == $document->amount);
+                $total_paid_match = ((double) $request['mc_gross'] == $invoice->amount);
 
                 if ($receiver_match && $total_paid_match) {
-                    event(new PaymentReceived($document, $request->merge(['type' => 'income'])));
+                    event(new PaymentReceived($invoice, $request->merge(['type' => 'income'])));
                 }
 
                 if (!$receiver_match) {
diff --git a/modules/PaypalStandard/Resources/views/show.blade.php b/modules/PaypalStandard/Resources/views/show.blade.php
index 56ce12eb9..7248daf36 100644
--- a/modules/PaypalStandard/Resources/views/show.blade.php
+++ b/modules/PaypalStandard/Resources/views/show.blade.php
@@ -21,29 +21,29 @@
                 <input type="hidden" name="upload" value="1" />
                 <input type="hidden" name="business" value="{{ $setting['email'] }}" />
                 <?php $i = 1; ?>
-                @foreach ($document->items as $item)
+                @foreach ($invoice->items as $item)
                     <input type="hidden" name="item_name_{{ $i }}" value="{{ $item->name }}" />
                     <input type="hidden" name="amount_{{ $i }}" value="{{ $item->price }}" />
                     <input type="hidden" name="quantity_{{ $i }}" value="{{ $item->quantity }}" />
                     <?php $i++; ?>
                 @endforeach
-                <input type="hidden" name="currency_code" value="{{ $document->currency_code}}" />
-                <input type="hidden" name="first_name" value="{{ $document->first_name }}" />
-                <input type="hidden" name="last_name" value="{{ $document->last_name }}" />
-                <input type="hidden" name="address1" value="{{ $document->customer_address }}" />
+                <input type="hidden" name="currency_code" value="{{ $invoice->currency_code}}" />
+                <input type="hidden" name="first_name" value="{{ $invoice->first_name }}" />
+                <input type="hidden" name="last_name" value="{{ $invoice->last_name }}" />
+                <input type="hidden" name="address1" value="{{ $invoice->customer_address }}" />
                 <input type="hidden" name="address_override" value="0" />
-                <input type="hidden" name="email" value="{{ $document->customer_email }}" />
-                <input type="hidden" name="invoice" value="{{ $document->id . '-' . $document->customer_name }}" />
+                <input type="hidden" name="email" value="{{ $invoice->customer_email }}" />
+                <input type="hidden" name="invoice" value="{{ $invoice->id . '-' . $invoice->customer_name }}" />
                 <input type="hidden" name="lc" value="{{ $setting['language'] }}" />
                 <input type="hidden" name="rm" value="2" />
                 <input type="hidden" name="no_note" value="1" />
                 <input type="hidden" name="no_shipping" value="1" />
                 <input type="hidden" name="charset" value="utf-8" />
-                <input type="hidden" name="return" value="{{ route('portal.invoices.paypal-standard.return', $document->id) }}" />
-                <input type="hidden" name="notify_url" value="{{ route('portal.invoices.paypal-standard.complete', $document->id) }}" />
-                <input type="hidden" name="cancel_return" value="{{ $document_url }}" />
+                <input type="hidden" name="return" value="{{ route('portal.invoices.paypal-standard.return', $invoice->id) }}" />
+                <input type="hidden" name="notify_url" value="{{ route('portal.invoices.paypal-standard.complete', $invoice->id) }}" />
+                <input type="hidden" name="cancel_return" value="{{ $invoice_url }}" />
                 <input type="hidden" name="paymentaction" value="{{ $setting['transaction'] }}" />
-                <input type="hidden" name="custom" value="{{ $document->id }}" />
+                <input type="hidden" name="custom" value="{{ $invoice->id }}" />
                 <input type="hidden" name="bn" value="Akaunting_2.0_WPS" />
 
                 <input type="submit" value="{{ trans('general.confirm') }}" class="btn btn-success" />