feat: send WhatsApp notification on GRN confirmed

app/Notifications/Purchase/GoodsReceiptConfirmedNotification.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Notifications\Purchase;
+
+use App\Models\GoodsReceiptNote;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Notification;
+use PromoSeven\UltraMessage\UltraMessageChannel;
+use PromoSeven\UltraMessage\UltraMessageMessage;
+
+class GoodsReceiptConfirmedNotification extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    public function __construct(private GoodsReceiptNote $grn) {}
+
+    public function via(mixed $notifiable): array
+    {
+        return [UltraMessageChannel::class];
+    }
+
+    public function toUltraMessage(mixed $notifiable): UltraMessageMessage
+    {
+        return UltraMessageMessage::text(
+            "GRN *#{$this->grn->grn_number}* has been confirmed and goods received.\n\nPO Reference: {$this->grn->purchaseOrder->po_number}\nDate: {$this->grn->received_date}"
+        );
+    }
+}