feat(sales): fresh sales implementation

app/Domains/Sales/Mail/InvoiceViewedMail.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Domains\Sales\Mail;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+/**
+ * Tells the company that one of its invoices has just been opened.
+ *
+ * This one travels inward, to the address the company nominated for view
+ * notifications, so it goes out under the installation's own mail identity
+ * rather than the address the invoice itself was sent from.
+ */
+class InvoiceViewedMail extends Mailable
+{
+    use Queueable;
+    use SerializesModels;
+
+    public $data;
+
+    /**
+     * @param  array  $data  the invoice that was opened and the user it
+     *                       belongs to, shaped as the view expects them
+     */
+    public function __construct(
+        $data
+    ) {
+        $this->data = $data;
+    }
+
+    /**
+     * @return $this
+     */
+    public function build()
+    {
+        return $this->subject(__('notification_view_invoice'))
+            ->from(config('mail.from.address'), config('mail.from.name'))
+            ->markdown('emails.viewed.invoice', [
+                // Handed over as a list, not as a keyed array. The numeric
+                // keys that produces are inert: the view reads $data, which
+                // Laravel already supplies from the public property above.
+                'data',
+                $this->data,
+            ]);
+    }
+}