diff --git a/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php b/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php
new file mode 100644
index 000000000..3f7979d57
--- /dev/null
+++ b/app/Http/Controllers/V1/Admin/Settings/CompanyCurrencyCheckTransactionsController.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Crater\Http\Controllers\V1\Admin\Settings;
+
+use Crater\Http\Controllers\Controller;
+use Crater\Models\Company;
+use Illuminate\Http\Request;
+
+class CompanyCurrencyCheckTransactionsController extends Controller
+{
+    /**
+     * Handle the incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function __invoke(Request $request)
+    {
+        $company = Company::find($request->header('company'));
+
+        $this->authorize('manage company', $company);
+
+        if ($company->hasTransactions()) {
+            return response()->json([
+                'success' => false,
+            ]);
+        }
+
+        return response()->json([
+            'success' => true,
+        ]);
+    }
+}
diff --git a/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php b/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
index 264b0af70..f2c879c6b 100644
--- a/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
+++ b/app/Http/Controllers/V1/Admin/Settings/UpdateCompanySettingsController.php
@@ -17,9 +17,20 @@ class UpdateCompanySettingsController extends Controller
      */
     public function __invoke(UpdateSettingsRequest $request)
     {
-        $this->authorize('manage company', Company::find($request->header('company')));
+        $company = Company::find($request->header('company'));
+        $this->authorize('manage company', $company);
 
-        CompanySetting::setSettings($request->settings, $request->header('company'));
+        $companyCurrency = CompanySetting::getSetting('currency', $request->header('company'));
+        $data = $request->settings;
+
+        if ($companyCurrency !== $data['currency'] && $company->hasTransactions()) {
+            return response()->json([
+                'success' => false,
+                'message' => 'You cannot change currency once transaction is created.'
+            ]);
+        }
+
+        CompanySetting::setSettings($data, $request->header('company'));
 
         return response()->json([
             'success' => true,
diff --git a/app/Http/Controllers/V1/PDF/EstimatePdfController.php b/app/Http/Controllers/V1/PDF/EstimatePdfController.php
index 80e96915d..64f65cce5 100644
--- a/app/Http/Controllers/V1/PDF/EstimatePdfController.php
+++ b/app/Http/Controllers/V1/PDF/EstimatePdfController.php
@@ -4,6 +4,7 @@
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Estimate;
+use Illuminate\Http\Request;
 
 class EstimatePdfController extends Controller
 {
@@ -13,8 +14,13 @@ class EstimatePdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Estimate $estimate)
+    public function __invoke(Request $request, Estimate $estimate)
     {
+        if ($request->has('preview')) {
+            return $estimate->getPDFData();
+        }
+
+
         return $estimate->getGeneratedPDFOrStream('estimate');
     }
 }
diff --git a/app/Http/Controllers/V1/PDF/InvoicePdfController.php b/app/Http/Controllers/V1/PDF/InvoicePdfController.php
index 07a78f45a..6f3c47c98 100644
--- a/app/Http/Controllers/V1/PDF/InvoicePdfController.php
+++ b/app/Http/Controllers/V1/PDF/InvoicePdfController.php
@@ -4,6 +4,7 @@
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Invoice;
+use Illuminate\Http\Request;
 
 class InvoicePdfController extends Controller
 {
@@ -13,8 +14,12 @@ class InvoicePdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Invoice $invoice)
+    public function __invoke(Request $request, Invoice $invoice)
     {
+        if ($request->has('preview')) {
+            return $invoice->getPDFData();
+        }
+
         return $invoice->getGeneratedPDFOrStream('invoice');
     }
 }
diff --git a/app/Http/Controllers/V1/PDF/PaymentPdfController.php b/app/Http/Controllers/V1/PDF/PaymentPdfController.php
index c091e7243..fec5fa4bb 100644
--- a/app/Http/Controllers/V1/PDF/PaymentPdfController.php
+++ b/app/Http/Controllers/V1/PDF/PaymentPdfController.php
@@ -4,6 +4,7 @@
 
 use Crater\Http\Controllers\Controller;
 use Crater\Models\Payment;
+use Illuminate\Http\Request;
 
 class PaymentPdfController extends Controller
 {
@@ -13,8 +14,12 @@ class PaymentPdfController extends Controller
      * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\Response
      */
-    public function __invoke(Payment $payment)
+    public function __invoke(Request $request, Payment $payment)
     {
+        if ($request->has('preview')) {
+            return view('app.pdf.payment.payment');
+        }
+
         return $payment->getGeneratedPDFOrStream('payment');
     }
 }
diff --git a/app/Models/Company.php b/app/Models/Company.php
index 2a3b29084..a0d9fddbb 100644
--- a/app/Models/Company.php
+++ b/app/Models/Company.php
@@ -380,4 +380,21 @@ public function checkModelData($model)
             $model->taxes()->delete();
         }
     }
+
+    public function hasTransactions()
+    {
+        if (
+            $this->customers()->exists() ||
+            $this->items()->exists() ||
+            $this->invoices()->exists() ||
+            $this->estimates()->exists() ||
+            $this->expenses()->exists() ||
+            $this->payments()->exists() ||
+            $this->recurringInvoices()->exists()
+        ) {
+            return true;
+        }
+
+        return false;
+    }
 }
diff --git a/app/Models/Estimate.php b/app/Models/Estimate.php
index f9aa6eb37..5b7c3b8fd 100644
--- a/app/Models/Estimate.php
+++ b/app/Models/Estimate.php
@@ -412,6 +412,10 @@ public function getPDFData()
             'taxes' => $taxes,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.estimate.'.$estimateTemplate);
+        }
+
         return PDF::loadView('app.pdf.estimate.'.$estimateTemplate);
     }
 
diff --git a/app/Models/Invoice.php b/app/Models/Invoice.php
index 396fc1166..464390af4 100644
--- a/app/Models/Invoice.php
+++ b/app/Models/Invoice.php
@@ -575,6 +575,10 @@ public function getPDFData()
             'taxes' => $taxes,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.invoice.'.$invoiceTemplate);
+        }
+
         return PDF::loadView('app.pdf.invoice.'.$invoiceTemplate);
     }
 
diff --git a/app/Models/Payment.php b/app/Models/Payment.php
index f0afd2c69..83a17441d 100644
--- a/app/Models/Payment.php
+++ b/app/Models/Payment.php
@@ -375,6 +375,10 @@ public function getPDFData()
             'logo' => $logo ?? null,
         ]);
 
+        if (request()->has('preview')) {
+            return view('app.pdf.payment.payment');
+        }
+
         return PDF::loadView('app.pdf.payment.payment');
     }
 
diff --git a/app/Models/RecurringInvoice.php b/app/Models/RecurringInvoice.php
index 6666ea5d7..aa3ecabbc 100644
--- a/app/Models/RecurringInvoice.php
+++ b/app/Models/RecurringInvoice.php
@@ -305,9 +305,15 @@ public function createInvoice()
             ->setCustomer($this->customer_id)
             ->setNextNumbers();
 
+        $days = CompanySetting::getSetting('invoice_due_date_days', $this->company_id);
+
+        if (! $days || $days == "null") {
+            $days = 7;
+        }
+
         $newInvoice['creator_id'] = $this->creator_id;
         $newInvoice['invoice_date'] = Carbon::today()->format('Y-m-d');
-        $newInvoice['due_date'] = Carbon::today()->addDays(7)->format('Y-m-d');
+        $newInvoice['due_date'] = Carbon::today()->addDays($days)->format('Y-m-d');
         $newInvoice['status'] = Invoice::STATUS_DRAFT;
         $newInvoice['company_id'] = $this->company_id;
         $newInvoice['paid_status'] = Invoice::STATUS_UNPAID;
diff --git a/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php b/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php
new file mode 100644
index 000000000..a87a7351a
--- /dev/null
+++ b/database/migrations/2022_03_03_063237_change_over_due_status_to_sent.php
@@ -0,0 +1,35 @@
+<?php
+
+use Crater\Models\Invoice;
+use Illuminate\Database\Migrations\Migration;
+
+class ChangeOverDueStatusToSent extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $overdueInvoices = Invoice::where('status', 'OVERDUE')->get();
+
+        if ($overdueInvoices) {
+            $overdueInvoices->map(function ($overdueInvoice) {
+                $overdueInvoice->status = Invoice::STATUS_SENT;
+                $overdueInvoice->overdue = true;
+                $overdueInvoice->save();
+            });
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}
diff --git a/routes/api.php b/routes/api.php
index 784760eab..b81cbd79b 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -67,6 +67,7 @@
 use Crater\Http\Controllers\V1\Admin\Role\AbilitiesController;
 use Crater\Http\Controllers\V1\Admin\Role\RolesController;
 use Crater\Http\Controllers\V1\Admin\Settings\CompanyController;
+use Crater\Http\Controllers\V1\Admin\Settings\CompanyCurrencyCheckTransactionsController;
 use Crater\Http\Controllers\V1\Admin\Settings\DiskController;
 use Crater\Http\Controllers\V1\Admin\Settings\GetCompanyMailConfigurationController;
 use Crater\Http\Controllers\V1\Admin\Settings\GetCompanySettingsController;
@@ -394,6 +395,8 @@
 
             Route::post('/settings', UpdateSettingsController::class);
 
+            Route::get('/company/has-transactions', CompanyCurrencyCheckTransactionsController::class);
+
 
             // Mails
             //----------------------------------