Add all files

app/Observers/InvoiceObserver.php

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+<?php
+
+namespace App\Observers;
+
+use App\Events\Invoice as InvoiceEvent;
+use App\Models\Invoice;
+
+class InvoiceObserver
+{
+    /**
+     * Handle the Invoice "creating" event.
+     */
+    public function creating(Invoice $invoice): void
+    {
+        event(new InvoiceEvent\Creating($invoice));
+    }
+
+    /**
+     * Handle the Invoice "created" event.
+     */
+    public function created(Invoice $invoice): void
+    {
+        event(new InvoiceEvent\Created($invoice));
+
+        $sendEmail = $invoice->send_create_email;
+
+        dispatch(function () use ($invoice, $sendEmail) {
+            event(new InvoiceEvent\Finalized($invoice, $sendEmail));
+        })->afterResponse();
+    }
+
+    /**
+     * Handle the Invoice "updating" event.
+     */
+    public function updating(Invoice $invoice): void
+    {
+        event(new InvoiceEvent\Updating($invoice));
+    }
+
+    /**
+     * Handle the Invoice "updated" event.
+     */
+    public function updated(Invoice $invoice): void
+    {
+        if ($invoice->isDirty('status') && $invoice->status == 'paid') {
+            event(new InvoiceEvent\Paid($invoice));
+        }
+        event(new InvoiceEvent\Updated($invoice));
+    }
+
+    /**
+     * Handle the Invoice "deleted" event.
+     */
+    public function deleted(Invoice $invoice): void
+    {
+        event(new InvoiceEvent\Deleted($invoice));
+    }
+}