'boolean']; public function routeNotificationFor(string $channel, mixed $notification = null): ?string { return $this->whatsapp_number; } public function purchaseOrders() { return $this->hasMany(PurchaseOrder::class); } public function invoices() { return $this->hasMany(SupplierInvoice::class); } public function payments() { return $this->hasMany(SupplierPayment::class); } }